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Discussion Starter #1
so i found a '94 2500 4x4 auto reg cab long bed w/ 133k for pretty cheap, and the guy says that it was running fine until he switched the fuel filter out, now it idles rough. i know thats wicked vague, but its all the info ive got, and im a complete cummins n00b. any cummins doctors around?? :confused:
 

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sounds like a little air in the lines. crack the injector line nut at the head while its running. one at time. should bleed any air out of there.
 

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How long has it been running rough like that, air isn't going to stay in the lines for a very long time... it may have a clogged injector.
 

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Discussion Starter #4
its not mine.....yet. i found a guy selling his and the only issue he mentioned was rough idling, which started once he switched out the fuel filter. I guess he hasn't had it that long either. He was going to build it up i think, but never got around to it because of work.
 
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