smcpc, I own three 300CE's (one 1992 and two 1991's) and don't consider them slow at all. The 1990 - 1992 300CE's have the 104 engine rated at 217HP. I suspect that replacing the Oxygen sensor will improve substantially the standing start performance. When the car is stopped at a traffic light or stop sign move the gear shift lever down to "2" momentarily and then back to "D' ... when you accelerate the transmission will start out in first gear instead of second gear which should make a noticeable difference. The 104 engines perform better at higher RPM's. You should check the condition of the spark plugs (recommend Bosch F8DC4), distributor cap, distributor rotor and ignition wires ... they may all need replacing due to their age ... all may be original parts. Also, change the fuel filter ... due to be changed every 60,000 miles. Your best bet is to have a PPI (pe-purchase inspection) done by a MB-trained tech and get a comprehensive evaluation of the car's mechanical and cosmetic condition. Be careful about buying a car that has had major body and paint work done. A complete set of service records is very valuable so you know how well the car has been maintained and what components have been replaced and when.

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Fred Hoelzle