I've got all the small bugs worked out on the 03 except for when I start the car it stumbles or hesitates for about 15 to 20 secs and then clears up and idles up fine, the car has a tune with pulley, bigger injectors and a Diablo maf mafia, the plugs are new and gapped to 32 also have cleaned the maf and iac, anyone else have this problem or know what it could be?