Whats wrong with my truck?

QUENTINHOWARTH

MEMBER
1995 CHEVROLET SILVERADO
242 MILES

I have a 1995 chevy silverado 1500 ext. Cab truck with a 350 and a throttle body and around 242xxx mile on stock engine and rebuilt transmission but my problem is is when im stopped at a stop light or leaving it in park while running the rpms of the engine cut of and it seems like its wanting to still run but then it jus cuts out completely but before it does it sounds like rushing air going into the throttle body ive replaced the map sensor, egf valve, fuel filter, fuel pump and nothing seemed has to work any idea what it might be im thinking a sensor might have went bad but I have no clue what 1 it jus seems as though it sucks to much air into the throttle body and then it dies and makes the whole truck shake

1 Reply

WRENCHTECH

MECHANIC
20,757 POSTS

First eliminate all vacuum or air leaks in the system which you may have due to a worn out throttle body. You may have a bad IAC ( idle air control) but try cleaning the throttle body first. Remove the intake snorkel, have someone hold the throttle wide open for you and scrub the back side of the throttle plate and surrounding bore with an old tooth brush and some carb cleaner. Be sure to spray some into the small holes next to the throttle plate. That should help stabilize the idle. If it still has a problem, replace the IAC.