As the title suggests, the acceleration on my car is extremely poor. I though the problem was remedied, but it has not gone away. I guess you could compare it to a plugged up catalytic converter. When I step on the gas, the car takes forever to gain speed. and If I am doing a decent 50-60 mph and say I want to pass a slow moving car, I step down on the gas to accelerate and the car actually starts to lose speed and power. Any help would be greatly appreciated.

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1990 190E 3.0L