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I second Dan's suggestion for a fuel pressure gauge that you can see while driving (get the electric kind so you don't have fuel flow / connections in the cockpit). If you're experiencing any fuel insufficiency under load, you'll see that on the pressure gauge. I had a problem similar to what you describe on my vintage race 911 a few years ago. I had a couple fuel issues, including a restrictive filter before an external surge tank. Turns out that halfway through a session the surge tank was running empty due to the first fuel pump not keeping up with the engine. The pressure gauge showed this immediately.
Not a bad idea to have a spare coil on hand to rule that out too.
Scott
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