I do not have any specific experience with your problem, but I would say you should be wary about spending any more money at this dealer. Make sure they are fixing things that are properly diagnosed to be broken rather than just blindly throwing parts at the car.

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record