72 350SL Stalling

[MBOwner]

I have a beautiful 1972 350SL that is making me crazy. 130,000 miles After about 20 to 25 miles, and usually on hot days, it will start missing and then stall. Will not start. After 20 to 30 minutes it starts right up and runs like a champ. This problem became very consistant. I have replaced fuel pump and filter, coil, points and condenser. Finally got it to act up at my mechanic and ony 2 injectors were firing. Replaced the trigger points module and it has purred for the last month. The other morning, (cool morning), after 15 miles it shut down immediately. No missing or rough running as a warning, just like someone turned the key off. Would not start. Waited about 20 minutes and it fired right up and has run perfect since. From what I have read, ignition module? The one inside the fender? Thank you for any help, I need it!