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This evening after 55,000 miles of trouble free usage, my 2006 997.1 C4S started lurching, or lunging when under acceleration or under throttle. It started off slowly and very slight, but within 15 miles it was starting to get more violent. The engine RPM’s were not lunging, and the motor seems to stay calm, but the car was jerking in acceleration. When the accelerator was let off there was no more jerking. Does anyone have any idea what this may be, and has anyone experienced this? Thank you!

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Welcome to RennTech :welcomeani:

 

Sounds more like your have an ignition misfire.  Any codes?

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No codes. My wife thought I was tapping on the accelerator and doing it for fun. Took it to my mechanic this morning that specializes in all exotic cars. We drove it around, and couldn’t get it to replicate. He said clutch felt fine, and should have plenty of life left. He gave me some special injector cleaner and I have topped off the fuel. Going to drive it around today to flush system or get it to replicate. Maybe I got bad fuel? Don’t know, but very frustrating because you know something is lurking.

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Yep, bad gas. Put some "Heat" or any gas treatment that mixes with water and put it in the tank.

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