I changed the pump and filter... belts and suspenders for my mom she's 83 I want it to be as reliable as possible, may not be the right car for her, but she loves it. I got those from Needs Wings so I know they are good parts, Yes I installed them correctly. We attached the code reader, no codes, no lights. We attached a fuel pressure gauge and left it overnight and it read 50PSI in the morning. The electronics we changed (2 sensors cam and crank are Bosch). I did see the other posts with regard to the RCM fella and that was my next go to. It really seems like a timing/spark issue to me, but I don't know these cars. Once it starts it runs great, hence the head scratching. AMX I'll try that next. the 3 time cycle deal we tried before we changed the pump and filter it would fire right away on the third try, no backfire issues. Now it starts when it wants too sometimes up to 4 tries. What's up with the engine continuing to turn over even after you release the key from the crank position? You have to shut it off manually to get it to stop. Never seen that, but these are essentially Mercedes so who knows.

Thanks guys.