Recently my car has had this annoying stumble. Only happens right when I get step on the gas. I can feel the car hesitate for a split second then it goes off smoothly after. I cleaned the tb and iac. IAC counts are around 17-18 in park, engine warm and a/c off. I have a PTE custom alky chip, a kirban maf sensor(still saving up for ls1 maf and trans plus). Could a dirty injector cause a stumble? How bout a bad maf? Should I raise the IAC counts?