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How closely together are the MAP and Temp leads on the ECU connector? The sensors on the engine are not physically close, but I would suspect maybe you have a splice or a pin connector issue. Engine voltage starts a bit low, but then comes up to a normal range. I wonder if the voltage regulator section is causing some weird daisy chain problems.
 

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It's a Speed/Density system, so the air temperature along with the MAP and TPS readings are crucial to calculating air density. If one of the inputs goes bad, the JTEC uses stored values in the engine map to back-calculate approximate readings for the lost sensor.
 
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The damned coil packs are about as hard to get to as one could imagine. You would have an easier time just buying a set of gaskets and pulling the intake manifold. Then again, the fuel line disconnect is a bitch to reach too.
 

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Thanks for the update. I hope you get to the bottom of this. Remember - Plug & Play is far superior to Splice & Pray.
 
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