Question about 2003 GMC Sierra 1500

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I have a 1998 GMC 1500. For several years now I have experienced the same problem over and over. The check engine light comes on and eventually the truck starts running very rough. I have taken the truck to a pair of different shops now with the same "symptoms". They replace the plugs and O2 sensors which stops the rough running. However this does not fix the PROBLEM. Eventually the truck starts running rough again and the process repeats itself........ Any ideas?

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Resistance in plug wires ... degrades them. I find this as a standard GMC Sierra problem. Two sets on mine already. Coding is for misfires. Also, possible to unplug your MAS [mass air sensor] which will keep the 'check engine' light on at all times but it will no longer be in the circuit and could also be another solution to the problem. Changing out O2 sensors is just expensive since there are Banks A and B and each bank has 2 sensors. The cost from a part store is 80$+... hate to know what they charge you at a garage.

Go with the new wire set first.

Posted on Oct 15, 2008

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