99 GMC Sierra 4X4 100k running rough

By BillyDeKid
February 18, 2004 in 1999-2013 Silverado 1500 & Sierra 1500

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BillyDeKid

Posted February 18, 2004

I am posting for my Brother-in-law -- He has a 99 GMC Sierra 4X4 5.3L that has 100k+ miles. He has used it as a work truck towing daily.

About a month ago his truck started skipping on an intermittent basis. Stayed in the shop for about two weeks. PCM changed 4 times. Problem still exists. Owner says that he can move wiring harness block connected to PCM and problem will clear for a short time. However, GMC/Chevy service says harness is OK.

Any of you remember problems with this truck as far a wiring/PCM? He is frantic because it is his work truck, and is ready to buy a new truck.

Any help will be greatly appreciatred.

Billy De Kid.

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