93 caravan -- Runs great until it starts to hesitate -- chokes up -- it will repeat this several times -- as if it was not getting air?? gas?? slow down from 55 to 40 and it improves starts to run better.. back to 55 it gets worse --fuel pressure looks good ( with engine running ok) cleaned throttle body and idle air control no change...

it will run just fine for most of the day then suddenly acts up -- then runs ok for rest of day ??? any suggestions ?? thanks!!

 

Check the AIS motor, it may need to be cleaned or replaced. Also check the EGR tube, the tubes will plug up over time and cause some idle problems.