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plz help

  1. 1989 Mustang gt 5.0 running probs

    5.0L Tech
    hi iv got an 89 gt 5.0 when i got it it ran like crap. when ud start it sounded like it had a huge cam and was in it but its stock and sounds like its missing but when i would rev it up seemed like it ran fine then at adle same thing cam and missing now when i would drive and put a load on it...
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