After reading up on Mercedes Cold Start issues, here is what I have replaced without any improvement of the condition!
Fuel injectors Fuel filter Fuel Accumulator Fuel Regulator Fuel Distributor Fuel Pump Check Valve Cold Start Value Water temp sensor
Checked for leaks around fuel pumps.
The longer the car sits, the harder it is to start.
1 to 2 hours, starts quickly
6 to 8 hours, requires cranking for 4-6 times @ 5-6 seconds per crank.
what else could it be?
it cannot be the relay issue, due to sitting time differences. Also while at stop light, sometimes if I dump the pedal it will sputter and die if I don't ease off the pedal. But once RPMs get a little higher(like on the highway), I can dump the pedal and it runs great.