car starts accelerates for 30 minutes,acceleration stops while engine is running on 1995 Mercedes-Benz C280

car parked for 6 months after computer failed.Replaced one then black smoke developed then replaced airmass sensor,sparkplugs,battery, then developed a rough idling sound.

AFTER driving for 30 minutes engine stops then after cooling starts again.Replaced Fuel pump makes hissing sound.what is the cause

Asked by for the 1995 Mercedes-Benz C280