My 1987 300 SDL quit running after being parked at the airport overnight. It may not be related, but on the way to the airport it began losing power and wouldn't run over 60 mph. When trying to start it, it acted like it was starved for fuel. Replaced the lift pump (with used pump from running 300 D), purged the injector lines, started the car, but it sputtered and quit. Had the car towed home, tried to start it again, and it started and seemed to drive fine. Next morning wouldn't start again. Again purged the lines and she started and ran fine. Next morning wouldn't start again...

Any suggestions?

Thanks