Vibration then slow down and engine light
 

I'm driving all of the sudden no notice the 2015 Ford transit 350 starts sounding like a Harley and engine light goes on and then doesn't go. Does anyone have any idea of what it may be?

Did you just purchase fuel a short while ago?

Check your muffler, or the tail pipe.

The hesitation and shaking in the motor could be from your motor miss firing because of worn spark plugs and wires. I suggest you get you plugs and wires changed and your distributor and make sure you route your wires so that they aren't touching the exhaust manifold or anything that gets hot by just zip tying the wires.

is there still a 2015 vehicle being made today that uses a distributor and spark plug cables? Last one i seen was in the 90's

Mate, Service your engine or at least check for worn out spark plugs..