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  1. N

    07 suburban p0300 can’t figure out

    Was able to reset fuel composition and read again and down to 3 percent. But still running rough and knocking. Here are some screenshots of what I have now.
  2. N

    07 suburban p0300 can’t figure out

    Ty everyone for the help this has been driving me nuts. The only thing I forgot was I just filled up with gas the day that it happened from an Exxon station.
  3. N

    07 suburban p0300 can’t figure out

    Ok will try to see if new one I have can do it or if I can find scanner.
  4. N

    07 suburban p0300 can’t figure out

    No afm is disabled thru a tuner.
  5. N

    07 suburban p0300 can’t figure out

    Here is what I was able to pull with the cheap scanner I have I got better one but haven’t had time to hook it up. I’m running 87 with 10% ethanol.
  6. N

    07 suburban p0300 can’t figure out

    So I was driving my 07 5.3 flex fuel suburban home with the family when started running really rough. Pulled over and had p0300 code. Motor shakes bad sound like has a knock and it’s really hard to start. Had it towed home and started checking things. Fuel pressure is 55 at the fuel rail. The...

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