So, I have a 1988 240 DL that is having a semi-problem. If I park the car for awhile (anywhere from a few hours to overnight to a few days) I am able to start the engine quicky. However, when I shift from Park to Reverse, e.g. to back out of a parking space, the engine will either a.) stall completely or b.) the RPMs will drop extremely low, almost on the verge of causing a stall. I have tried various methods to try to prevent this from happening. I have tried revving the engine slightly when shifting from Park. However, I'm vaguely worried about damaging the transmission with this technique. If I let the engine idle for a few seconds before shifting, it will have the same result: stall or coming very close to doing so. This only happens when the car is first started after sitting.

I'm thinking that maybe it's one of the fuel pumps causing this. The way I see it, one of the pumps runs dry(?) when being parked, so when I start the car it has to sort of reprime. Maybe? That would explain this happening only on the initial start.

I've seen people mention things like this happening because of a bad AMM. However, once I get moving the car runs very smoothly. Plus I'm hoping its not the AMM, because I have no idea where to get a 007 one that may or may not fix my problem.

Anyone seen anything like this before? I'd appreciate any help. It's not like this is an urgent problem, but it's getting kind of annoying.