What happens when I start my manual car in fourth gear?

SB123

New member
This morning I was driving and, at a light, accidentally went forward in fourth gear (instead of second). The car now feels like it's running rough, has trouble at certain speeds in the gears I would use - like, at 35, it's in third not fourth or fifth. It's a 5-cylinder transmission.

What the heck did I do to my car??
I went from stationary or nearly-stationary in neutral, right into fourth gear.
 
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