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Q: why does 3.8 eng miss badly? on 2003 Chrysler Town & Country

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have replaced plugs,wires,fuel filter.Had cam and crank sensor replaced.replaced the ecm.Still has miss. Seems to have short on primary ignition circuit.Are there any known problems with wiring harness? TCM is ok.
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Spark, fuel, injector pulse or compression! Which is not there on the cylinder(s) the power control module says has a misfire? Then may be able to help. Coil pack can fail at any one or more plug wire terminals!!!
Wouldnt this show up as a code? The van has a miss that drops around 1000 rpm most of the time but not all the time. Nothing showed up on the mechanics code reader except it always goes back to a bad cam or crank sensor.
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