I just purchased a 1995 F150, V8 5.0, Standard transmission w/ 133,000 miles. The question is the Check Engine light keeps coming on for no apparent reason. Sometimes I think it is happening when I get up to 55-70mph then other times it comes on just driving around town. It never comes on for the same amount of time! The dealership said they thought that it was an O2 sensor or some sort of gas (reclaiming leftover gas) sensor and that it was all cleared up! Well wouldn't you know I got about 2 miles from the dealership and the light was on and they seem unsure why it is happening and keep telling me it's no big deal...it is probably just a faulty sensor...ANY IDEAS? thanks-