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Puff/Miss in exhaust.
I noticed recently, my 1990 Suburban 5.7 has a slight puff or miss in the exhaust at idle. Its not consistant, might puff 3 times in a row, stop for a second, puff once then start missing/puffing again. I did a compression test and all cylinders where between 145 to 150 psi. I dont notice a performance difference. I guess its just annoying haha Any ideas? Exhaust leak? Bad plug? Burnt valve?
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