Engine misfires (rough running) and lack of power are commonly caused by ignition coil pack or ignition module faults. Proper diagnoses should isolate the cause and prevent unnecessary replacement of good parts.
Average mileage: 75,407 (51,000–105,000)
8 people reported this problem
Replaced both coil packs @ $1400.00 each ($2800.00) 24 NGK Iridium Spark Plugs @$20.00 each x 24 ($480.00) Plus labor & sales tax.. Then replaced both catalytic converters with OEM Mercedes and O2 Sensors $2600.00+ Labor. & tax and car runs worst then anything I ever owned and no one can figure this shit out!!! WTF!! Is the problem!! Drove the car only 5,000 miles since I bought it in August 2013 .. Oh almost forgot $3000.00 for New front Airmatic struts for the front!! Unbelievable!!!