i just bought a 87 k5 with 350 tbi. 6inch suspension 3inch body lift. with 38's. Everything else is pretty much stock. Owner told me he put a new map sensor in it because the plugs kept fouling other than that there was nothing wrong. I did the usual, new plugs, wires, dist.cap rotor, new air filter, pcv valve. On the ride home ( 3 hours ) i noticed it got a little hot a couple of times. Now it is knocking and my oil pan gasket is bad. Bought a new oil pan gasket. Tried the trick with pulling plug wires. Noise stopped when i pulled #4 cylinder. Took out both rods and there is nothing wrong with them. I don't know what else it could be. Also it does not want to idle for me either. could this be one in the same or did i stir something up with the long drive.