Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
Hi, My name is ***** ***** for the delay.I will do my best to assist you.
can you keep it running in reverse with the throttle?
does the engine light stay on?if so,can you give me the computer codes?
sense you get no codes..
lets remove and clean the egr valve,,it may have carbon on it not lettuing it close all the way,making a vacuum leak from the exhaust
after you clean the egr valve and if it still does this,,disconnect the vacuum line to it and plug it,if that fixes the problem,,replace the egr solenoid[this is what the vacuum line from the egr valve connects to]
ok..tellhim to remove it to be sure that it is closing all the way
then,,check for a vacuum leak around the throttle body..these gaskets will rot from under the throttle body sometimes
if all this checks out,,then you need to make sure the iac is adjusted correctly,i know you have installed one,,but make sure it is adjusted right.
that will be fine