vacume leak. i had the same deal happen to me. also clean the iac and run seafoam through it. but for sur tighten up all your bolts and connections on your cai.
that is also true maybe even wires. i also got new wires at the same time soo..... the wires could have also helped me.could also be bad plugs.
motorcraft or autolite copper plugswell there no code but i fix it i used some carburetor cleaner on the intake manifold throttle and clean it with a tooth brush it work well thx guys i was thinking on changing my sparks plugs witch brand do u recommend??? thx