remove, clean, lubricate, and reinstall IAC motor... go through the reset procedure (do a search on the forum)
A slow IAC will cause a stutter.

check smoothness (impedance) of TPS sweep. calibrate using the oblong mount holes for 0.5v at closed throttle.
A dead spot will cause a stutter.

inspect injector spray pattern. a dripping injector will cause a pool, which will cause a stutter smile

HTH