1995 Mercedes-Benz C280 Q&A

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

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 -
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