megasquirt piggy back?
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It is way easier to use the stock lq4 pcm to run everything. We ran MS in a turbo mustang w/lq4 and an MSD for spark. Same setup in our 89 c1500 5.3 turbo. when we switched back to a stock PCM and used Hptuners both rigs ran way better, smoother, and were faster n the end. JMHO