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It seems that you probably have a major vacuum leak,causing a very hi idle and rough shifting . The fist thing is get a can of intake cleaner and with the engine runing ,spray around the base of the throttle body and observe any changes in idle speed. The gasket under the TBI has a habit of leaking. When there is an uncontrolled vacuum leak the engine just thinks you have opened the throttle. Good luck Moe
www.2carpros.com/.../oldsmobile-alero-1999-oldsmobile-alero-stumble-... Sep 28, 2008 - Engine Performance problem 1999 Oldsmobile Alero 6 cyl Front ... Hey All, Had a very rough running Mazda 626 on LPG, engine code FP.
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1999 Oldsmobile Alero High Idle Fix ... How To Fix Or Prevent Stalling, Surging Or Rough Idle, Cleaning Throttle Body and MAF Sensor ...
You would need to figure out if you are dealing with a fuel problem or an ignition problem to proceed. Have you checked for vac leaks and know for a fact the engine has compression on all 4 cylinders ?
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