Update: this was fixed by replacing the crank position sensor.

Car keeps cutting out under high load and high rpm. Has hit or miss idle - sometimes it holds, sometimes it doesn't. Usually fires right up on a cold start, with further starts sometimes working and sometimes not.

Car has been tuned for the 243 heads and cam that are in it. It doesn't shut off under light load while driving. If it cuts out like it does in the video, it will usually have trouble finding idle again.

Idle has been set at 1100 and 800 over 2 separate tunes. Idle speed does not effect whether or not it holds idle.

I went through the entire electrical system as this seemed like a ground issue. Adding 3 extra grounds, for a total of 6 around the cylinder heads and block, did not fix.

Next step is a crank position sensor.

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