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This just can't be that hard to fix. Just about everything is pretty easy to trace. There are only so many sensors that will significantly impact the car's running... I would think that MWR is going to be as good at the mechanical side of the equation as anyone... the ECU- perhaps not?????
I have not much of a clue about the piggy back, and I agree with Charlie about never being quite "right" with the piggy back. I had one back in the day when the FI kits first came out (was Xede from tri-point) and it was never really "right"... Charlie's tune got it "right" at first and then when I went to the standalone, it stayed "right"... So is the problem your piggy back fighting the ECU, a bad tune etc? Or is the problem something silly like a bad MAF or bad crank sensor. Perhaps the piggy back is more sensative to something like the crank sensor and is causing sync problems? I've seen this before-- especially with the crank sensor.... These problems are usually something pretty simple and end up with a "oh duh" when the problem is found....
Good luck,
Phil
Can you just bypass the piggyback and run the car on the stock ECU under low load to atleast check the wiring and mechanics?
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