Recently I had an issue where after the car ran for about 15 minutes it would run really rough, stumble, cut off at idle and be hard to restart for until it cooled down. I replaced all lines, filters, clamps, primer pump. Finally swapped out fuel lift pump with a junkyard one and haven't had the problem since. Id try lift pump before ip if all else has been exhausted

__________________

1996 E300 110,000
1985 300TD 212,000
1980 300D 238,000