svalencia

My honda civic is an automatic, I recently had the idle air control valve fixed by a friend because after months of the car sitting up, once i cranked it was idling up and down over and over, so i just had it worked on, and my friend said he fixed it without replacing it, the gas pedal doesnt stick, it just skips when u try to accelerate a little, or jerks, it mainly feels like a jerk backwards when u slow down or ease up on the gas, and the engine light is on...at first i thought the problem would go away because the car hasnt been driven until the car just got worked on a few days ago, after my friend worked on the idle air control valve, it stopped revving, but now the other problem i explained happened..and when u first drive the car it is fine all the way up to 60 mph, but once u ease off the gas, thats when this happens, i just checked the rpm when sitting in neutral and it is at 1 or 1,000?