Thanks for the help guys! I'm going to buy a compression tester tommorrow (the 4th). I will let you know what I find. If I did have a stuck open valve wouldn't I get a backfire into the intake or exhaust? I guess if it was backfiring into the exhaust it wouldn't be a backfire and I probably wouldn't notice it! Would that be considered front fire? I bought the truck for $200 as a second work truck/ loaner (eliminate people asking me to help them move, etc) and I have no idea of its background. Does anyone recommend an engine oil cleaner that might free up a sticking valve without taking the valve cover off? The fuel injection manifold along with a bunch of other stuff will have to be taken off first. I have no problem with changing an engine or head but just trying to slide by easy on this one. It runs and I can still drive it but I feel like a cross between Jud Clampett and chitty chitty bang bang.