Jul 182012
 

I have a 2001 GMC sierra 1500 8cyl 5.3L. When i am speading up slowly, just crusing, are climbing a hill it will start hesitating kind of bad. I have already changed the plugs and wires. What else could cause this.

  One Response to “GMC Sierra is hesitating going up hills”

  1. If there is a check engine light on, I would start there.
    Have the codes pulled with a scan tool. Many auto parts stores will do this for free.

    If there are no codes, no check engine light, I would start by making sure the air filter is clean and then have the MAF Sensor cleaned.

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