Question about Chevrolet Suburban 2500

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Engine idles very smooth but part to full throttle it runs very poorly almost dies. It does not shake or miss on any one cylinder. New fuel pump installed and fuel pressure good. New distributor, plugs, wires,computer,disconnected exhaust in front of cat and no difference.

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  • Dwaynne Efird Sep 17, 2010

    Check Engine Light came on once--knock sensor.

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I had this same problem. Try the Mass Air Flow sensor. Depending on how the MAF sensor is bad... You can unplug it and fix the problem. The sensor restricts the air flow. Too much fuel and not enough air. Or you can disconnect the tube that goes to your air box.

Posted on Sep 17, 2010

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Is the check engine light On.If yes.Then did you got the car scanned for error codes.If not then get the car scanned for error codes.As per the error code it will detect the exact faulty part in the car due to which the problem is occurring. For more help: --- at www.autozone.com it's absolutely free to get car scanned. -------------- Keep updated.Thanks.

Posted on Sep 16, 2010

  • raj somaiya
    raj somaiya Sep 17, 2010

    did you replaced the knock sensor and checked as per the check engine light code.Replace the part and recheck,if the check engine light still comes ON after replacing the knock sensor.
    Thanks for keeping updated with your query.

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