Run the codes and see what the computer thinks is wrong.

That'll at least point in a direction.

Not sure about the mist, I assume the test was done with key on, engine off? Only thing I can think of is that when you first switch the engine on, I believe the TBI pumps a shot of gas to prime the system for starting. But it has been a long time and I might be mistaken. Odds are that you turned the key on and by the time you got to the throttle for testing the shot was over and just the fumes remained.

Might pay to have someone turn the key on while you watch to verify.