Some arm chair musings as it is too cold and dark outside to investigate now. The newly purchased 1990 245 had the battery drained from a power door lock short, which I disconnected and then charged the battery. The first start up thereafter felt like it was running on 3 cylinders, then after revving once or twice it evened out and seemed normal. The P.O. said when stone cold it lacked power the first time you accelerated. I assume it is a vacuum leak, and I noticed a bad crack on the fuel rail return line-could that be part of it?

On a positive note, I was able to change the door lock out (vandalized) and isolate the short to the drivers central lock harness before the weather turned too cold.