i was having idle issues found out that it was my missing throtte stop screw, i fixed the idle issue and it was running great for a few days and then the other day the cel came on and when you accerlate it gets really jerky and starts to buck. i checked the cel and it was 14 for iac valve. I cleaned it and it still does it. Any suggestions? ive checked for a vacuum leak and havent found one im confused.. Also not to long ago i replaced the plugs wires, cap, rotor.

 

Also it?only does it after you drive for bout 15-20 minutes