ANSWERS: 2
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it could be the ECU. I would also check the engine oil for coolent. Quad 4s are notorious for blowing head gaskets and warping heads (if bad enough, the inability to maintain engine pressure will seem like an ignition issue)
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i have the same problem and the same engine but on a 92 model and have replaced all the same things you have and the computer also ( ecm ) and still no fire on my vehicle and i have 150 psi on each piston combustion chamber. wish i could find out too.
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