My H/C car is hesitating when cold - runs OK when warm. It did not do this when it was first tuned (Edit) about six months ago; there are no codes being thrown....

I assume it could be:

1. plug wires (newer wires and plugs are less than 10K miles)
2. clogged fuel filter
3. oil residue on the MAF wire
4. dirty injectors
5. crappy Edit tune

Any ideas - THX?