[AKCJ]

Seems like now would be a good time to check your belts. It's possible (not likely but possible) that it has just jumped a tooth or two. If the timing belt jumps the engine would run but just run bad.

I don't think this is the problem but it needs to be checked. Timing belt, balance belt, tensioner, all rollers.

Also, hows the distributer cap and rotor?

I don't think the above items explain the smoke but still, it's worth checking.

Do a compression check to see about valves?

I'm hoping you don't have a major engine failure.

Good Luck.