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  1. 4.0 running like crap

    I bought a 1992 ranger with the 4.0 back that I owned a few years ago. In that time it had another 4.0 installed right before I got it. It runs like crap. Idles fine, but and soon as you start driving, its popping and stuff real bad. Figured firing order. In the process of checking it, I found...

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