A few years ago, a friend of mine asked me to stop by with my scan gauge because his supercharged 3800 engine wasn't running right. I saw engine oil sprayed over the intake and front valve cover, and the oil dipstick was pulled out about 3 inches. I new immediately what happened. I pulled off the number 4 spark plug wire, and the engine ran the same.
He neglected to tell me that he was stuck in the snow, and he kept spinning the tires and putting the trans into drive followed by reverse. I knew that he was getting the compression from cylinder 4 into the oil pan. He detonated cylinder #4 which caused the piston turn to mush at the top. He was lucky that a Pontiac mechanic friend repaired it by boring it .010 over for about $900. He got off cheap. Not often do I hear of a misfire caused by low compression...good luck