I have had this same problem. You need to find out what the error codes are and the pending codes are. Also HOW MANY MILES ARE ON IT. This is a very important question. Also your service history. This sounds like fouled plugs caused by need of a valve job. Sounds like a big job, and it is, but with the right info, tools and time you can have this Truck running like new. I would first try Seafoam in the gas. Seafoam is a cleaner you can pick up at auto parts store. Works much better than STP fuel cleaner. The way you can tell is simply removing the spark plugs and inspect. If your O2 sensor is bad your check engine light should come on and stay on. O2 sensors don't go bad and then start working correctly normally. Check a few things and write back.
Tuesday, September 19th, 2006 AT 5:05 PM