I have a 1993 300e 2.8L gas eng. 104 motor, with 83K miles. It's difficult to start in the cold weather: gas pedal needs to be feathered like its a poorly tuned carbuerated engine. I've replaced OVP relay, engine wiring harness, plugs, injectors, eng. temp sensor, fuel filter. Dealership tested a new throttle body and for $1700 bucks said that the cold start prob. is now fixed.

Can I clean up my old throttle body? Can I spray it down with carb. cleaner to remove any dirt? Can I replaced a small part on it to make it perfom like new? REally need anyones advice!