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My Lincoln MKC 2016, is kind of shaky when it starts but once I give it gas it’s fine. The coolant is low after a few days of filling it. The computer analyzer says there is a misfire on cylinder #4

had the same code 2 weeks ago but I could definitely tell it was missing when I was driving. We changed the spark plugs and saw spark plug for had some oil on it. There was a hose unhooked in the back of the engine we reconnected it. Now the car is not missing while it is driving but it is very shaky when I start it.
 

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Do you know where you’re missing the coolant from, have you checked your oil to make sure that it’s not frothy

By the way I don’t know if any common problems with the motor except for carbon buildup around the valves, not saying I know it all but I’ve definitely never heard of any common problems with the motor
 

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So if it were me and my first thought on a misfire is always to swap plugs and swap coils. If you can swap a coil between one and four and you begin misfiring on one you know the problem. Misfires are definitely common when you get oil buildup around the intake valves, 100,000 miles is about the time when you start noticing that. But if it were my car I’d want to figure out that coolant issue first just to make sure that these aren’t one in the same issues. If you are handy where I would start is with a coolant pressure test, clear out where your coolant issue is, some of the serious things could be a head gasket, or water pump, but without frothy oil should not be a water pump unless you’re leaking coolant on the ground as well

I hope that helps steer you unfortunately with misfires there’s a lot of diagnosis as well as coolant leaks
 

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Direct injection engines are known to have carbon build up, as copbait mentioned. Pretty much all engines will end up with rough idle and run a little rough too. Plus next to impossible to prevent since the gas doesn't go over that section. Footnote, I am unaware if this build up causes misfire.
 

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These engines are notorious for coolant intrusion into the cylinders. Mine was covered under warranty.
 

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2017 Lincoln MKC
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Misfire on #2 cylinder, so says check engine light. Took it in for an oil change and the check engine light popped on. Asked them to check it out yesterday. Call this morning confirmed coolant in #2 cylinder. New engine block and associated parts on order. Service mgr says covered under warranty. Whew. Looks like a couple of weeks before I will be back in the saddle again. 2017 MKC Select, 2.0T I purchased last April with 52k miles. Second oil change now at 63K. I love this vehicle. Going to be a long two weeks.😢
 

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Four weeks at the dealer and picked it up today. All good.
 
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