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Timing might be off...
by jrocmoney99 on Oct 19 2018, 7:57 PMSo i have a 1990 300zx and the idle jumps alot. Im unsure if this is the timing or somethings else. I changed the iacv and all vacuum hoses but still have this issue.
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We recommend monitoring fuel trims on scanner, should be close to 100% alpha to be normal. If more than 10% plus or minus out of range, it could have a vacuum leak, faulty MAF sensor, jumped timing belt, etc..