I used carb and choke cleaner attempting to clean the ISV behind the upper intake manfiold plenum and the AFM while removing the factory airbox and installing a hot air intake (temporary).
Now driving the car around and testing it (at night), didnt get a look during the day, at some point in accelerating the car hesitated and a light quickly flashed and went out, located next to brake lining light. When I pulled back into my driveway, I tried revving the engine and each time i seemed to hesitate right after i pressed the gas but revved as it should have, kinda like a stutter or shake.
What could this be?
*EDIT* Some more info..
I did a tune-up last year, new fuel filter, plug wires, plugs, oil and filter, didn't touch the o2 sensor yet.
When I did all my vacuum lines, i had the intake manifold out and lower manifold as well, and cleaned the injector jozzles by hand as best I could while still inside the plenum.