My '88 420sel was running fantastic, and then left me on the side of the road. Would restart, go about 30 feet and die. Restart go about 50 feet and die. The more I did this the shorter the distance it would go, and it took a longer time to restart. Had it towed 20 miles, it started and drove of wrecker into driveway. Now it will restart instantly, but only drive about 30-40 feet without stalling. Changed fuel filter. No difference. Changed idle air control valve that I had and no change. Jumpered the terminals you mentioned and PRESTO! car runs fine, drives around the block and sits and idles until I shut it off. Sure appears to be fuel pump relay, but all the ones I have seen for same age car as mine have a different number! Mine matches what the shop manual calls for--has six pins on one side and four on the other. Thanks for any help on this. Steve