1987 chevy S10 engine idle problem

Need to connect a fuel pressure gauge and see if you are getting sufficient pressure to the tbi

Chevrolet S-10 Questions - Fuel System Loses Pressure ...

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CarGurusJul 28, 2012 - Fuel System Loses Pressure - I have a 2003 Chevy S-10 Pick Up with the 4 ... car a few times, what essentially you are doing is priming the fuel pressure. ... A dirty fuel filter will not cause the lines to lose pressure after the engine is shut off. ... I have a 98 s10 2.2 liter and it was driving fine all day then when ...

Chevrolet S-10 Questions - My 2001 S10 has a hard starting ...

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CarGurusSep 16, 2012 - My 2001 S10 has a hard starting problem if the truck sits between 1 ... Vacuum leak, have you checked fuel pressure while it sits? ... Would the spider alsocause a misfire at low rpms? .... at an idle, or squeaking while driving and it gets faster as you go? ..... 1994 Chevrolet S-10 2 Dr STD Standard Cab LB.

Chevy S-10 Won't Start - Repalced Fuel Pump and Pressure ...

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Chevrolet S-10 pickup won't run and has no fire unless I jumper the fuel pump relay. ... Once the truck starts and is running you can remove the jumper to the fuel pump ... Iwould get the fuel pressure checked to start with, because that's where the ... 93 gmc 4.3l FI runs but dies out loss of power after 5 mins of running then ...

Stalling S10: I Have a 1994 Chevy S10 2.2l It Stalls After 35 ...

Make sure the injectors are pulsing. Whatch to make sure mists oj fuel are coming out.

Check Static Fuel Pressure engine off , Should be about 10 to 13 psi this will determine if Fuel Pressure Regulator is faulty , if pressure is bleeding off it will be hard starting... If you find a bad regulator then replace it with new... Bleed pressure off by removing fuel tank filler cap and by releiveing it at the fuel rail before the TBI unit....

Check the fuel pressure at the shredder valve, you should have 13 to 13.5psi, anything other then that will give you problems in the GM TBI. If the pressure is bad, then you may have to replace the fuel pressure regulator at the bottom of the TB. 
Good luck and keep me posted. 

Check the trottle body postioning sensor...

you have to reset base idle see manual at library for procedure

That eliminates the crankshaft and camshaft position sensors. Have you checked the fuel injector itself for an open winding or stuck valve plunger? There should not be a steady 12 volts to the injector--if good injector, it would be spraying fuel steadily into the throttle body. But at least the engine should try to run if poorly. Take the injector out, dry it off with air, and intermittently apply 12 volts to one terminal while grounding the other. You should hear a click from inside every time you touch 12 volts. If not, replace it. If it does, it may be plugged with debris. Try blowing through it in reverse with compressed air.

Check the injector for 12v on one wire. if good check the other wire for a ground witth the key on. The ground wire pulses from the ECM If you dont have 12v from one wire to the other but you have 12v from one wire to battery ground then be sure the ground wire is good to the computer. If you don't have 12 v at any time check for open hot wire or bad fuse. ADD 12v to the hot wire at the injector. DO NOT add to the wrong wire or you will fry the computer

4 Cylinders A 2.5L TBI (found in 47% of 1991 Chevrolet S10 P/U 2WD)
4 Cylinders E 2.5L TBI (found in 53% of 1991 Chevrolet S10 P/U 2WD)
6 Cylinders R 2.8L TBI (found in 47% of 1991 Chevrolet S10 P/U 2WD)
6 Cylinders Z 4.3L TBI (found in 53% of 1991 Chevrolet S10 P/U 2WD)