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2004 GMC Sierra 2500 HD Question: P0301 code came on and the truck is lurching a low RPM

 

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2004 GMC sierra, 8.1L V8, Shoshone, ID, March 16, 2012, 11:54
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We bought a GMC sierra 2500HD a montha go, low miles. The check engin light has came on a few times and disappeared after a day or so. The we got off of it was P0301. I changed the spark plugs with Irriduim plugs and the code came back on this morning, but I noticed it is lurching when I let off the throttle this time. Any Ideas?

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    Greg's Orange Auto (13020 Answers) , Orange, CA - (714) 361-9386
    globalhelper March 16, 2012, 13:34
     Master

    POSSIBLE COIL PAK OR WIRE ISSUE WHICH IS COMMON

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    2004 GMC sierra, March 16, 2012, 13:43
     Rookie

    how does the cylinder numbering go on the new GMC's?

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    globalhelper, March 17, 2012, 11:39
     Master

    d/s is 1 2 3 4 p/s 5 6 7 8

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    2004 GMC sierra, March 19, 2012, 07:19
     Rookie

    So I tested the plug wires and coil this weekend. All were functioning fine with the check engine light on. I notice a few other things this weekend, the rpm meter and the speedometer are pretty jerky and the light only seems to come on when I am pushing the engine (ie: when I pass or pulled a hill or haul a load). There have been a lot of modifications done to the intake and exhaust, If they reprogrammed the computer would that cause these issues?

    Did some reasearchand it seems the was a recall one the instrument cluster but I bought the truck a few months after the deadline.

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