BishShip3

Bought my 87 late last year and it always had a rough idle. Did a complete tune up including new distributor. Just finished putting new intake manifold gaskets in. New EGR valve and oil pressure sensor. Ran and idled great. Parked it for a few minutes and then when I started it back up, it was idling worse than ever. Runs great when driving. What to try next?

leesvet

are there ANY SES lites ???

codes?

if not, I can almost guarantee you that your injectors are toast. have them ohms tested then call Jon.

playsdixie

you didn't mention the iac....have you checked it/replaced it?

1 check for codes first

2 make sure your NEW egr valve is working
3 check your Iac
4 check tps/ min idle adjustment
5 get a fsm...gm.....check fuel pressure
good luck....

BishShip3

Thanks guys. It looks like it's a vacuum line issue.