Replace fuel injector

It sounds like your 1989 Chevrolet S10 may have a problem with the fuel injectors or the fuel system. When you disconnect one of the injectors and the engine starts, it suggests that one or more of the injectors may be stuck open and flooding the engine with fuel. This could be caused by a malfunctioning injector, a problem with the fuel pressure regulator, or a
Here are a few things you can try to troubleshoot the issue:

1. Inspect the fuel injectors for any signs of damage or malfunction. The injectors may need to be cleaned or replaced if they are not functioning properly.
2. Check the fuel pressure using a fuel pressure gauge. The fuel pressure should be within the manufacturer's specified range. If the pressure is too high, it could be caused by a faulty fuel pressure regulator.
3. Replace the fuel filter if it is clogged or dirty. A clogged fuel filter can restrict the flow of fuel to the engine and cause starting and running problems.
4. Check the control panel for any error codes or messages that may indicate the cause of the issue.

Its telling you the P.C.M /computer is detecting a problem with fuel delivery on injector #2.This dosen't mean the injector is is bad it means its not getting enough fuel .It could be a lot of reasons but the first thing I would do replace the inline fuel filter from the tank to the engine this can restrict fuel flow to the regular witch will drop the fuel pressure to the injectors .The filter likely clear up the problem bot fuel pumps don't last for ever and clogged shorten there lives.

If plug an plug wire has been replaced , an dist. cap an rotor an problem is still there ,maybe a fuel injector problem .
Perform the fuel injector coil test. Refer to Fuel Injector Solenoid Coil Test .
A fuel injector coil winding resistance that is too high or too low will affect engine drivability. A fuel injector control circuit DTC may not set, but a misfire may be apparent. The fuel injector coil windings are affected by temperature. The resistance of the fuel injector coil windings will increase as the temperature of the fuel injector increases.
Diagnostic Aids
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Monitoring the misfire current counters, or misfire graph, may help to isolate the fuel injector that is causing the condition.

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Operating the vehicle over a wide temperature range may help isolate the fuel injector that is causing the condition.

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Perform the fuel injector coil test within the conditions of the customer's concern. A fuel injector condition may only be apparent at a certain temperature, or under certain conditions.

2

Observe the ECT Sensor parameter with a scan tool.
Is the ECT Sensor parameter within the specified range?
10-32?°C (50-90?°F)
Go to Step 3
Go to Step 4

3

1. Disconnect the multi-way harness connector of the fuel injectors.
2. Measure the resistance of each fuel injector between the ignition 1 circuit and the fuel injector control circuit, at the multi-way connector with a DMM. Refer to Testing for Continuity in Wiring Systems.

Is the resistance within the specified range for each injector?
11-14 ohms
Go to Fuel Injector Balance Test with Special Tool or Fuel Injector Balance Test with Tech 2
Go to Step 6

4

1. Disconnect the multi-way harness connector of the fuel injectors.
2. Measure the resistance of each fuel injector between the ignition 1 voltage circuit and the fuel injector control circuit, at the multi-way connector with a DMM. Refer to Testing for Continuity in Wiring Systems.
3. Record each fuel injector resistance value.
4. Subtract the lowest resistance value from the highest resistance value.

Is the difference equal to, or less than, the specified value?
3 ohms
Go to Fuel Injector Balance Test with Special Tool or Fuel Injector Balance Test with Tech 2
Go to Step 5

Ugh... sticky injectors are common for that era of Ford! Make sure your fuel filter is fairly new, and regularly use some fuel injector cleaner. Verify pressure at the fuel rail, and replace the pressure regulator and/or fuel pump as necessary. (The fuel injector cleaner may actually fix the problem, but you may need to replace the offending injector eventually.)

The fuel injectors are not working as the should. Run some premium fuel and fuel injector cleaner to try and make problem go away.
It problem persists the injector computer circuit voltages require checking. Possible injector controller or injector replacement could be solution.

For jeep grand Cherokee fuel injectors replacing, i suggest you to go the help oink provided below:-----

Its a complete step by step procedure to do so:-----

Fuel Injector Replacing Jeep Grand Cherokee

http://www.howtorepairguide.com/2012/11/fuel-injector-replacing-jeep-grand.html
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How to Replace a Fuel Injector
http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-fuel-injector.html-----------

How to Test and Replace Fuel Injectors on Acura Car Models?

http://repairhelpcenter.blogspot.com/2011/11/how-to-test-and-replace-fuel-injectors.html
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How to change fuel injector on 2005 gmc envoy?
http://schematicsdiagram.blogspot.in/2012/03/how-to-change-fuel-injector-on-2005-gmc.html
------------These will help.Thanks.

Give some more details of the problem.

REPLACE THE FUEL INJECTOR CANT REBUILT IT.IF YOU REMOVE FUEL INJECTORS FUEL RAIL YOU HAVE TO REPLACE GROMMETS AND O RINGS ON ALL THE FUEL INJECTORS IF NOT YOU WILL HAVE A INTAKE LEAK AT THE OLD FUEL INJECTORS SEALS.REPLACE THE FUEL INJECTOR YOU REBUILT THEY HAVE TO BE REPLACED.

Best Practices

• Using lower quality gasoline can result in recurring fuel injector problems, even after a fuel injector replacement.
  

• Fuel injector seals should always be replaced along with fuel injectors.
  

Common Symptoms

• Failing fuel injectors can cause engine misfiring and hesitation. The Check Engine Light may come on and set diagnostic trouble code(s).
  

On the 3.4 liter V6 the #5 cylinder is on the driver's, firewall side. The #5 cylinder on the 3.8 V6 is on the driver's, radiator side. 
Check the spark plug wire and replaced if needed and also the spark plug, also if may be a good thing to add fuel injector cleaner to the gas tank for the next few fill up to clean out the fuel injectors just to make sure that it's not a dirty injector problem and also replace the fuel filter just to make sure that the fuel pressure and flow is adequate for proper fuel injector operation.
A good fuel injector additives is the Lucas fuel injector, the price is unbeatable to the amount you get. Just follow the instructions on the bottle and hope this will fix the problem. Keep me posted, be glad to help you get your car running 100% soon.