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

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

by in Las Vegas, NV on May 16, 2013
2 answers 8 comments
ANSWER by on May 16, 2013
was it adjusted properly and do you have any other codes?
COMMENT by on May 16, 2013
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 by on May 16, 2013
no ypu may have a vaccum leak or misfire issue
COMMENT by on May 16, 2013
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 by on May 16, 2013
was iac adj correctly or not?
COMMENT by on May 16, 2013
Im not sure I just put it in. And put the bolt the same distance as the old one
ANSWER by on May 17, 2013
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 by on May 17, 2013
Ok thank you I would have to tow it because the car will not start. Whats the name of your shop
COMMENT by on May 20, 2013
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 by on May 20, 2013
Thanks for all the help. I found out it was my ecm. So I changed it out