Checked fuel pump relay, no bad solder joints or burn marks that i could find. No corrosion on the pins either. I guess i will just wait until it happens again and then try jumping the pins on the relay to see if that starts the car right up or not.

Is it pin 15 and 87 on the relay?

Also put some dry gas in there as Haasman suggested.

__________________
1988 190e 2.3 with 91 engine