crap contacts/grounds in the Throttle actuator, buggered up fuel filters, Fuel quality issues, arcing wires, due for a tune up, throttle body dirty, MAF sensor issues, Coil pack(s) Faulty (if equipped).... the list is endless, how many miles are on your car? Sedan? Wagon? Coupe?

Edit: had another thought. Fuel pump(s) not putting out enough pressure

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hum.....
1987 300TD 311,000M Stolen. Presumed destroyed