1991 Cadillac DeVille Q&A

1991 Cadillac DeVille Question: I replaced my isc motor but my car still idles rough in drive at stop

Why does my 91 deville with a 4.9 liter idle ruff feels like it is going to die I replaced isc motor and measured where the screw sits on the throttle arm. But it still doesnt idle smooth. Is this something that will work its self out or do I need to do something else -
Answer 1
was it adjusted properly and do you have any other codes? -
Comment 1
Ok now I was running my ac in park and my car dies and will not start. Do I have to turn up my idle? -
Comment 2
no ypu may have a vaccum leak or misfire issue -
Comment 3
Ok even if I didnt touch any vacume lines. And just from running the ac it can throw off timing? And I just replaced the ics last night. -
Comment 4
was iac adj correctly or not? -
Comment 5
Im not sure I just put it in. And put the bolt the same distance as the old one -
Answer 2
I agree with globalhelper the iac needs to be adjusted correctly or/and you may have vacuum leaks. I see that you are in Vegas, if it will help bring the car down to the shop and we will look at it free of charge. Without seeing the car it will be hard to give you any better advise. -
Comment 1
Ok thank you I would have to tow it because the car will not start. Whats the name of your shop -
Comment 2
PAUL'S AUTO SERVICE 1754 E CHARTLESTON BLVD LAS VEGAS, NV. 89104 702-384-7636 THE TOW COMPANY WE USE CHARGES $55 ANYWHERE IN TOWN. PLEASE GIVE ME A CALL IF YOU NEED THERE NUMBER. THANKS JOHN -
Comment 3
Thanks for all the help. I found out it was my ecm. So I changed it out -