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Rough Idle on Deceleration 1996

2K views 2 replies 2 participants last post by  96dieselfan 
Possibly your oil is foaming. Is the level ok?
Try holding the rpm at 3500 in neutral for 2 minutes, then back off the throttle quickly. If the engine then idles rough you have a high pressure oil issue. If the level is ok, remove the IPR valve and clean it.
 
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