|
Janice, have you checked the idle adjustment screw on the throttle body to make sure it's as far down as it can go?
If it is the next step is to pull the intake off of the throttle body and plug the little hole you find there. That is the ISCV (Idle Speed Control Valve) and when you plug it the engine should just about stall. If it doesn't that means that you have air getting into the engine from another source. This could be a leak in a vacuum line somewhere or a problem with how the butterfly valve is seating in the throttle body. If it does nearly stall that means that the ISCV is allowing too much air into the engine when it's supposed to be at idle.
Another more remote possibility is that your mechanical timing is too far advanced. Do you know if it's on or not?
|