Thread: Mysterious force holding the car back: slower acceleration, lower mileage. brake????
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Old 05-07-2007, 09:25 AM
G-Benz's Avatar
G-Benz G-Benz is offline
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Join Date: Apr 2001
Location: Dallas/Fort-Worth
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Don't know if your model has a MAS (mass air sensor) or not, but on the ML, a bad one seriously degrades acceleration and gas mileage.

My indie discovered a cracked intake manifold when doing the head gasket on my W124...while it didn't hamper gas mileage, but it did diminish acceleration ability.

Bad ignition coils will also create the same symptoms.

Just some other things to check out...
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