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the spider injection leak would also make it run rough. you can tell it has a leak when, after you stop the car for a while after driving, it takes a moment to for enough gas to get in to ignite. almost like the sound of a carb bowl filling up. then it turns over. otherwise, check all of the sensors, the egr, the air intake, the oxygen sensor for carbonation and clean them. sometimes, that helps a bit...

after, disconnect the battery for ten to thirty seconds for the CPU to reset.

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Q: Could iacv valve make 94 jimmy 4.3 vortec vin w run rough?
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