Question about GMC Sierra 2500HD
Run a compression check to ensure it is not mechanical, i.e. ring crack etc. Hook up to a scan tool and explore missfire monitoring via live data. Answer should lie within one of the afore mentioned.
Posted on Feb 16, 2012
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Posted on Jan 02, 2017
Have you put new sparks plugs in it. If you havent I would try them first. Only run the ac delco plugs listed for the truck. I have had many people come threw the shop with misfiring and trucks running like **** and come to find out they put bosch or ngk plugs in it. Your manual says there good for 100,000 miles but there really only good for about 75,000 or so. Also run some lucas fuel treatment or b12 chemtool. both you ad straight to the gas tank. If it calls for one can for 20 gallons buy two and double the treatment it wont hurt you engine.
Posted on Mar 01, 2009
Recheck the ignition module, The module is what the coil pack sits on and the wire harness may be damaged due to corrosion or broken wires. At worst, the module is bad it self and needs to be replaced. Good luck and hope this helps.
Posted on Oct 28, 2009
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