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Hi Roger:
For an engine to run it needs the correct mix of fuel and air.
When you give it throttle you are giving it more air, and the carb is supposed to deliver more fuel.
If it dies, then the carb is not doing it's job so I'd start by cleaning the carb. Even a spray cleaner might fix it. Also, if there is a drain then flush the carb and try again with fresh gas.
If there is no carb and it is fuel injected, then I did not have enough info to begin with.
A poor spray pattern in the injectors can cause starting issues. Have you tried a good (read not really cheap) fuel injector cleaner like Chevron Techron or Valvoline Synpower fuel system cleaner? A weak ignition system (worn spark plugs, leaking wires) can cause starting issues. You mentioned that it has a K&N filter on it. These filters use an oil in a cotton media to filter out dirt. Sometimes that oil can get out of the filter and contaminate the mass air-flow sensor. Follow the air tube after the filter box and you'll find a sensor in the tube with several wires running from it. It is made from aluminum and the wire housing is plastic. Remove it from the tube and clean it with a mass air-flow sensor cleaner. You HAVE to use a mass air-flow sensor cleaner specifically made for mass air sensors. Don't use anything else like carb, brake, or throttle body cleaner. Those cleaners will leave a residue on the sensor and just cause you more issues.
As for your fuel pressure, the system pressure with the key on, engine off is 60-66 psi. Do you really think you could visually tell the difference between 60 psi and 40 psi? I know I couldn't. You'll have to use a fuel pressure gauge to verify the pressure. For my money, I think your pressure is low. But, cleaning the MAF is much easier then putting a tester in, and it wouldn't hurt, so I would do that first.
starting definately has a lot to do with the crank/cam position sensors, but it wouldnt have nothing to do with hot or cold weather, oxygen sensor will make the vehicle run too rich if its out, you will smell fuel very strong out the exhaust, that could make it run sluggish also, and usually if the mass air flow sensor goes out the vehicle wont start at all...
you have to monitor the fuel pressure, if you find that the pressure drops off as soon as the engine has started you should check the fuel pump resistor located on the frame next to the windshield washer tank. If the resistor is ok see if you can keep the engine running with carb cleaner. If the engine stays running on the carb cleaner try disconnecting the mass air flow sensor and see if the engine continues to run by itself. This is all taking for granted that there is not a security system problem. check if the security light keeps flashing while trying to start.
It might have something to do with your mass/air sensor located on the intake tube. Try cleaning the mass air sensor with the appropriate cleaner and also try cleaning the throttle body with carb cleaner.
did you try cleaning the idle control valve and the egr valve out with carb cleaner.try that before replacing any parts,also if there is any codes in the system those should also lead you in the right direction.
ok, this is simple to do but I would get the Chilton for your car so you can have pictures of what to do. You can get the chilton at the parts store, or the library. It sounds like a throtle body sensor or the throtle body itself, but could also be your air idle control sensor. go down and buy some mass air flow sensor cleaner and a BIG can of carb cleaner. First clean the mass air flow sensor neer the air filter. then remove the throtle body it is held in by 4 botls and you may need a new gasket, NO GASKET GLUE. Now take that big old can of carb cleaner and start cleaning in and out. also down into manifold. clean everything. Now put it back together, remember 4 bolts and no gasket glue. if the problem continues replace the throtle body sensor. and then the idle air intake. It will be cheaper to take it into the part store and have them put it on the computer. They can often tell you what sensor it is ahead of all this but don't let this stop you from cleaning out the throtle body, it will make your car run better and longer.
mass air flow sensor (MAF) its not a cheep unit either. You can pull it off the air cleaner and see if anything is blocking air from travling through if so clean it with carb cleaner (dont touch sensor though) or remove any objects, then see if it helped.
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