hello i have a question on my 1986 mercedes 300e it falls dead 5 minutes after the first start in the morning. it starts up great but when it fall dead it wont start untill the next day. ok... here is what i dont understand about this car. on the first start if i hold the accelerator to about 2000 rpm for a few minutes it wont fall dead. i change the fuel pump,fuel pump relay,fuel filter,i check the fuel pressure regulator. when it fell dead i disconnect the fuel line from the fpr turn it over and fuel was coming out good. i dont know what to check next do anyone know what i should check for next im lost thank you for the help guys.