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It definitely has a miss or thud, thud, thud type of sound/feel. But at idle it's tough to notice any problem. The fuel trims were jumping up to 25-32% under acceleration so I'm thinking a header leak or loose spark plug causing it to read lean and dump extra fuel in. My car would run at 12-13% fuel trim before the tune but I do have dual cats so he has a little less backpressure.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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