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Originally Posted by musicboy745
...What causes this?
o2 sensor?
computer?...
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Answer can be yes or no - as there are myriad possibilities... If u have VGE, first thing to check is plugs/cap/wires (VE coilpacks).
What else: Air leak(s), O2, MAF, TPS, harness, contacts ... go through all link pages below. After correctin what u find, run self diag.