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Lots of good ideas here. Quick check: see if the vacuum line to the FPR has suction on it when the engine is running (vacuum line leak); smell the end and see if it smells like gasoline. If so the FPR is likely bad. After the engine cools, and in a quiet place, turn the throttle cam on the throttle body by hand and see if you can hear the faint "click" just as it starts to move and that the spring fully re-seats the shaft to fully closed. Also check the switch contacts with an ohm meter to verify the switch is good.
Also consider the O2 sensor. It can cause weird accel issues. These are my candidates.
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3 944's, 2 Boxsters and one Caman S, and now one 951 turbo. Really miss the Cayman.
Some people try to turn back their "odometers." Not me. I want people to know 'why' I look this way. I've traveled a long way and some of the roads weren't paved.
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