2011 mb c300 sport - sluggish/vibration upon acceleration
What is your question?
Intermittently, especially going uphill or from stop to start. After that, it runs smooth and seems it has normal power. Sounds like it is idling fine at 600 rpm. I thought the 5 year old spark plugs were the cause. Changed them. Same condition. Added some Gumout fuel injector cleaner to 12 gallons of gas. No improvement. Car just passed SMOG test. No faults.
What makes this problem better or worse?
Going uphill or starting from a stop
How long has your 2011 Mercedes-Benz C300 had this problem?
RepairPal Certified shops can diagnose and repair your 2011 Mercedes-Benz C300. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
This could be a transmission issue. I'd start by checking for codes and checking for software updates. This will need to go to a shop unless you have the proper equipment. Use this link to find a good shop near you.
https://repairpal.com/repair-shops
Alex
