I have a 1993 850 which, until recently, was running great. In December she starting to lose power and flash the check engine light when I went over large bumps in the road. The car would also stall when I was attempting to parallel park or sometimes when I drove slowly up a ramp into a parking garage (low RPM, heavy load type of situation.) Eventually, I went over a bump and the check engine light came on and stayed on. I took the car to the dealer and they replaced the engine speed sensor. This seemed to solve the problem for about one week. Then the intermittent stuttering power loss and check engine light started happeneing again. After another week, the car would not start one morning. I got it started by holding down the gas and attempting to start it multiple times. As I was driving down the highway attempting to burn out the carbon (a problem I was told is common in these cars, especially with the city driving I do) the check engine light came on and stayed on again. I took it back to the dealer and this time he replaced the throttle position sensor. The car was fine for the drive home, but the next morning I felt the same old skipping power loss with the flashing of the check engine light. This past weekend I replaced the wires, plugs, and distributer cap and rotor. She ran great that afternoon. This morning she refused to start again. She would crank and almost start but when I released the key it immediately stopped. I got it started on the sixth or seventh attempt. When I tried to drive her down the road, the car would stall. This was a new problem as she never stalled before. I could get her started but the idle was rough and as soon as I tried to accelerate the car stalls. Please help me!! I think it's a fuel problem but I'm getting desperate. Any advice would be greatly appreciated!

Thanks