c250 Cold Start Misfire

I have a 2013 c250 160k miles with the M271.8 engine. Hopefully someone here will have an idea! I recently changed my high pressure fuel pump, HPFP, the day after replacing the pump my car would idle really rough and misfire for 45 seconds then itll rev up 1500-2000 rpm and drop back down to right below 1000 rpm. The car doesnt misfrie on any other start just the first one after sitting for over 6 hours and while driving if im cruising at 1500 rpm itll sometimes misfire randomly. I had... c250 Cold Start Misfire

I have a 2013 c250 160k miles with the M271.8 engine. Hopefully someone here will have an idea! I recently changed my high pressure fuel pump, HPFP, the day after replacing the pump my car would idle really rough and misfire for 45 seconds then itll rev up 1500-2000 rpm and drop back down to right below 1000 rpm. The car doesnt misfrie on any other start just the first one after sitting for over 6 hours and while driving if im cruising at 1500 rpm itll sometimes misfire randomly. I had...

c250 Cold Start Misfire

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