Hey guys I have a 97 cavalier with the l67 swapped in and the engine is rebuild as well with better internals. So I have about 1000 miles on it and noticed that I was letting out a puff of smoke after running it good a couple times. When I rev it up it smokes just a little. I pulled all the plugs out and #5 was totally fouled/black and smoke was coming out of the spark plug hole. I switched injectors and re-did the lower intake gasket just in case it was pulling oil through some how or had an injector leaking. After all that its still smoking. I did a compression test hot and cold and its the same as the other front cylinders. Im really at a loss on this one. There is no drivability issues at all. Any advise would be awesome!