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    Re: Problems with new engine, need HELP!

    Yep, just double checked with Matt, that was the problem with mine. It was a tooth off. About a week ago I damaged my upstream O2 sensor and it was acting up. I could get it past idle though.
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    Re: Problems with new engine, need HELP!

    This same thing happened when Matt and I started my 4.0 for the first time. I can't remember what it was. I think it may have been what Jim said, distributor was off a hair. I remember Matt...
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    Re: Problems with new engine, need HELP!

    O2 sensor? I guess you're not getting any codes? Did you go through the CAM lifter break in procedure? Not that has anything to do with you backfire...
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