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HELP:revs up smooth but drops off, then runs rough.

551 views 2 replies 3 participants last post by  saedrin 
#1 ·
1990 1.6L
when I slowly rev the engine with no load it revs smooth for a little while then it starts to run rough all of a sudden. i check all the vacuum lines, intake filter is clean. I searched but i didn't find anything similar to my problem. I'll try to post a video of the problem.
 
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