1994 cutlass supreme V6 3.4L Vin(x) RPM QUESTION?

Question

hi guys thanks for looking, ok when i just tap my gas pedal just a lil tap the rmp goes up to 2 sits there for about 4 seconds then idles back down to 1, and when your driving and coming to a stop the car doesnt idle down to 1 until after it sits idleing high at 1 1/2 for about 4 seconds then it drops down to 1, what could be making the car take so long to idle down to normal, its almost like its sticking, the throttle returns all the way but it wants to hoover at the 1 1/2 mark befor returning to normal idle at 1, oh and when i shift gears my engine jerks real bad if i dont let the rmps drop down to 1

Answer 1

Either idle air control, or throttle position sensor failure.
Have you lubed your linkages?

Answer 2

The first thing you always have to do is check for any codes being stored in the PCM as a lot of times these codes are the cause of this. Repair these codes if any and recheck. If condition is still there, be sure the ignition cables, coils, and spark plugs are in good shape and not causing any misfires. Then check for any vacuum leaks especially around the intake and/or hoses. There is a hose at the rear of the motor that goes over to the brake booster that caused a lot of trouble. Intake gaskets were always a problem on these as well. You could also be having an IAC motor hang up on you. Cleaning the whole throttle body and IAC bores and the IAC will help that. Good luck.

Answer 3

Throttle linkage may need backing off just a little.Their could be a defective throttle possition sensor,vacuum hose leak at fuel pressure regulator.Have a blessed day.

Answer 4

Could be the idle air control motor,If you have a check engine light on have it read and see what that is telling you.

Answer 5

guess throtle body gasket leking spray carb clener on throttlebody gasket if it leaks engine will act up