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95 Deville 4.9L Rough Idle and surges at intersections


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My 95 Deville 4.9 L V8 has been surging and loping ant idle when the car is in gear. When it is not in gear it runs fine and when I am driving it runs fine it's just when I am stopped by a red light or stop sign that the engine surges and it has a rough Idle. Please help!

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Not sure why it won't act up when it is not in gear but it sounds like there may be an issue with the idle speed control motor. There is a ton of information in the archives on the ISC.

Kevin
'93 Fleetwood Brougham
'05 Deville
'04 Deville
2013 Silverado Z71

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