I have a 90 Lumina 3.1l 4speed auto trans it dies at idle and sometimes when I come to a stop. I suspect either the Iac or the egr but I don't know how to test either since the egr is electric and not vacuum. It hasn't coded for anything so that was no help. I am stumped any help is appreciated thanks.

 

my 91 corsica hesitates upon acceleration, bucks, ect. and often dies at stops, have replaced the oxgen sensor , the iac, and the throttle position sensor, and still doing it, have found 2 vacum leaks and fix , the code scanner at the parts store still reads, bad oxigen sensor , bad tps, and cam sensor , any suggestions?

 

you can go to easy auto diagnostics .com and get procedures for testing the electrical parts, but I can tell you that I had similar problems with a 91 lumina 3.1 and the problem ended up being the injectors. you have to remove the plenum to test them, but after replacing a whole bunch of parts, it ended up being bad electrical portions of the injectors. Its a pain to get to them because of removing the plenum but after you pull your hair out trying all the other parts, go there and see what ya find.