This is not my car, it is a friends car. She bought it new a long time ago. Car has been maintained (with records ) at the dealership since the day it was bought, awesome looking and driving still after 180,000 miles.

recently, the car developed a problem where you hit the gas, with minimal response, and and you need to really floor it to get engine to respond. it is very sluggish and lacking on power... the dealer took it in and started changing parts left and right but did not cure the problem. they suspected and changed the o2 sensor, nothing improved. the then they suspected the distributor cap, wires and plugs, and nothing improved. after a $1500 bill, they still wanted another $1000 to change fuel pump because they "think" that might be the problem..i told her to cut her loses, and that i will diagnose and repair the problem for her with the help of the forum, because the way the money adds up at the dealership is ridicoulous (the actuall bill was $2500 because the changed the rear sub-frame bushings also...WAY too much)......

any how, i do think this is fuel related, but i am also suspecting the transmission/ torque converter... it shifts great with no problems or delayed engagement in any gears, but i noticed it is a bit harsher now changing gears since last time i drove it last year...but this could be a whole separate issue....

so bottom line is that car is sluggish as hell, and you need to really hit the gas hard to feel the car open-up and fly.....where to start diagnosing this problem?

thanks,

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1993 300E, 2.8 M104 .....