Alright I have an 02' silverado ext 4x4 with the 4.8L V8 I've been having some engine problems lately. I had a miss when I first bought the truck not noticeable normally only on the scanner computer thing. Changed the plugs and plug wires, on the scanner no more misses. Thought my problem was fixed. Then every once in a while I would start my truck start to drive off and it would be kind of hesitant. So I figured it was nothing so I would push down on the gas a little harder and my rpm's would spike almost as if something was clogged. Then it wouldn't happen for a little while. Now it happens a lot more almost every other time I start my truck. So I just pull over turn my truck off. Restart it and it runs fine, untill I start my truck the next time. I've noticed lately it's started spitting like black stuff out of the tailpipe. It's not full blown liquid or oil it seems more like a suet. My stepdad said its a valve or something and that the stuff out of my tailpipe is cause my pistons rigs are leaking. Anybody have any ideas on what it is? Any help would be appreciated. I'm going to my gf's house this weekend cause her dad is pretty much a mechanic. He has a computer and all that stuff.
My next thing is that if this motor is pretty much gone I wouldn't mine replacing it with something bigger like the 5.3L if anyone knows how difficult it would be to swap the engines as in just swapping engines and flashing the computer compared to changing trany, computer, etc... Or where a decent place is to get motors for a good price. Or what I'm looking at for a swap or rebuild of my motor.
Thanks for any help.