Hi:
It could be timing or just cheap fuel. If you try better fuel, does it go away? Also, you may want to check the knock sensor. If it's bad, it will cause the same problem. It could also be caused by a crank or cam sensor. You may want to stop a a nationally recognized parts store and have them scan the computer for trouble codes. If there is a code stored, it will identify what the problem is. Most stores will do it for free.
If you want to check the timing, you will need a timing light. The proper timing will be on the truck's idntification info inder the hood.
Let me know what you find.
Joe
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Friday, November 14th, 2008 AT 11:59 PM