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  1. It is running like crap!

    alright so I have a 1990 ranger 4x4 with the 4.0. It has about 130K miles on it. Sometimes it runs great then other times it goes to crap. The tach surges sparatically and the engine just misses terribly at idel and on acceleration. It has new wires/plugs. I've replaced the Throttle position...

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