I have a 01 grand caravan with a 3.3 v6. The van spits sputters and backfires at low rpm. Once you give it some gas past 3000rpm runs great. I have changed spark plugs wires coil and IAC. Does anyone have any ideas what could be the problem? Any help would be appreciated.

 

Check Injector wiring harness that is routed behind the coil pack.

 

It also is showing a misfire on 5 and 6

 

All the more reason to check that harness. The exhaust melts the insulation shorting the wires together or to structure. A common problem especially on early 4th generation vans.