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Fixed!!!-partially
Ok the pump didn't fix it. And the fuel pressure still fluctuates even without the vaccuum hose.
But I found what is causing the missfire. I found an article saying to not use anyother spark plug wires except from GM. Went to the dealership, 60 dollars later missfire fixed. DO NOT BUY AUTOZONE WIRES-NOT EVEN PREMIUM WIRES.
But there still is a problem with power, I'll place new post.
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