Check your air filter replace if dirty, you will be surprised, use fuel treatment for cleaning injectors, if check engine light is still on, then you still have a problem
SOURCE: 1991 firebird will not idle cold and bogs down while driving
This sounds like a fuel issue to me. If I am not mistaken, this engine has two injectors running on a separate fuses. Remove the air cleaner assembly, and make sure both are firing while engine is running. If so, then check the fuel pressure. If you have a fuel pressure gauge, connect it to the fuel rail, and start it up. Remove the vacuum line from the fuel pressure regulator to see where it is set. You should have at least 36lbs of fuel pressure. If the pressure is too low, check the fuel filter. It may be clogged, or you might have a weak fuel pump.
Also you changed the throttle position sensor, you will need to make sure it is set properly.
hope this helps,
Chris
SOURCE: car is stalling and idleing irradically.
I Would Suggest That You Complete A Engine Cylinder Leak Down Test.....(not A Compression Test But A Leak Down Test) this will tell you if you have internal problems....possible worn rings or a burnt valve(s) I would use a smoke machine to check for vacuum leaks also. Good Luck
SOURCE: 1987 chevy S10 engine idle problem
relace the throtle air idle valve.The temp switch will allso cause this problem.
SOURCE: 1987 chevy s10 fuel injector problem. Install new
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.
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Do not know why. Truck came in with maf code and stopped up cat..checked with scanner for cam retard and that's what it was at
Has good fuel pressure
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