Hi All, I recently replaced all the spark plugs and coil packs on my daughter's 2011 Mercedes C300 4Matic w/110K. I had multiple codes after the replacement and with the help of the group finally determined that there was an issue with the "New" coil packs that I installed. I purchased 6 Bosch Coil Packs from RockAuto and the car runs great so I returned the others. Drove the car 300 miles ran great with no Check Engine Light! But......... I have noticed an occasional issue with cold starts there is some engine hesitation. It smooths out pretty fast but today (28 degrees) there was an up and down with the idle speed and it felt like it might stall. I gave it a little gas and it ran great ever since. I researched a little and came up with a few possible suggestions to look at: - Fuel Filter- Fuel Pump- MAF needs cleaning- Fuel Injectors That's quite a range of possibilities! Anyone have a similar issue who can share their fix? Thanks in advance! Bob K _______________________________________ http://www.okiebenz.com
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