starts runs fine but after a couple of minuetes check engine light comes on and it runs poor. like popping/backfire and stalling. can see gas flowing from injectors so i dont think its a feul problem. i also dont get any error codes.

If the light comes on there is a code.

ok there is acode. its 12 whitch from the book mean all normal. i 'm confused

12 just pretty much means everything's working. If I stick the key in mine it just flashes 12 12 12 12 12. If your check engine light comes on, there should be another code.

Could be a spark problem, make sure your plugs, wires, cap, and rotor are good. Might also could check fuel filter.

Hows your EGR? Does it move freely?