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

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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
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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?
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.
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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.
Ok thank you I would have to tow it because the car will not start. Whats the name of your shop
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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
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