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    Running rough and stalling - error 543

    Woo hoo! I got it fixed. On the advice of Mark Fosnaught at Clintonvilleauto.com I checked the EGR valve. It was only $18 so I decided to replace it and viola - problem gone! The truck is working just like it should. Thanks Mr. Shorty for the advice. It kept me hoping that I would...
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    Running rough and stalling - error 543

    Thanks Mr. Shorty! I'll try the tests you suggested and will post my results for others to see. I definitely received the 543 while doing the KOER test. It was also present during the KOEO test, so I don't know if it was persistent or not. I'll read your section on testing and re-test...
  3. P

    Running rough and stalling - error 543

    I have a '94 LTD 4WD with 120k miles. It will start up and idles fine for about two minutes, then the idle gets rough. The CEL comes on regularly. If I put it in drive or reverse it will usually stall out. When it stalls, I can immediately start it again. I can keep it going by giving it...
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