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valley996
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i tried the top end engine cleaner, the Porsche dealer here buys it from the GM dealership, I took the hose off and dumped it in slowly while revving the engine 1500 to 2000 RPM, drove it and it still has the surging at steady driving speeds, Now I'm going to take the exhaust system apart at the converters and run straight pipes out to see if its maybe a plugged converter, I'll let you ...

