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Message: <blockquote data-quote="Bacovish" data-source="post: 8508454" data-attributes="member: 668904">Had a similar problem with a dodge pick up. Under load it misfires and no power. At an idle everything was fine. Ended up being the catalytic was clogged. Ended up just punching it out and ran fine. If you can loosen your exhaust before the cat and might get lucky.Oh...it would also run good at start up and then start misfire. Think it was because the sensor would heat up a little causing the symtoms. I also thought it was a spark problem or fuel problem at first. Unfortunately the cat was the last thing I tried after about 2 weeks of jacking with.</blockquote>

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