67 twin turbo dart

Matts440 said

Got her on the dyno, everything was going good with dialing in the air and fuel, then when most ready to start the pulls the crank sensor would drop off at a certain rpm first was 2100, then turned back on the filter noise, got the crank sensor to drop off at 3800 rpm for some reason, its the shielded wire to connector. So sent a copy to Matt at diyautotune and then he asked for a crank tooth log, so we sent him that and waiting response since they are back east. So well see where this goes, car is still at the dyno shop. Will update when I have news.

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This sounds a lot like a similar issue I had with the Fitech and even with MS when I was running a distributor and the issue was that I was running the timing wire (the crank sensor in your case) too close and parallel to a coil wire going through the same hole in the firewall. Car idled and cruised fine but as soon as I put any load on the motor it would break up. I separated and rerouted those two wires and the problem went away. Remember if you can’t separate them it’s OK if the wires cross but not good if they run parallel to each other for any distance. So make sure the crank trigger lead isn’t running across coil wires or even the alternator charge wire (that one bit me too).