I'm new to this fourm. I just swaped the engine from a perfectly running 1981 380slc that i've been driving for weeks. I put the engine in the 1981 380SL and it ran perfect for about 2 miles, i started it up in town after it was running fine, started to drive it home it started running very poorly missing and some black somke coming out the back, as if it were running very ritch. I drained the fuel, with new fuel the same problem. when cold runs ok for about a minute. please help!