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Ronnie's companies

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  1. Ronnie's companies
    I am having a similar problem my truck starts fine and idles high at 900 rpm but will not accelerate it is also giving a fault code of 6-4 and I am hearing that it may have to do with the ECM/ecu but have not figured it out yet any idea?
  2. Ronnie's companies
    I have a 98 Mack rd 688 sx with a 350 engine and it will not rev up over 900 rpm and it is throwing a fault code of 6-4 any idea?

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