RB25 starts fine then sputters and dies HELP!

[240Lover770]

ive been dealing with this for about 2 or 3 weeks now and im out of ideas. it drove fine for a week when i got it with a slight stutter problem under acceleration. then i filled up one saturday and that night i was driving from a meet and it started sputtering really bad. hitting the accelerator did nothing but made it sputter worse then the engine died. pulled over to see if i could see anything wrong and nothing. went to start it and everything seemed fine. drove it for a few then it started sputtering when i gave it gas. wouldnt let me go past 1000 rpms. got it to a store parking lot and let it sit. started it up again and everything seemed fine. tried to drive down the street and it wouldnt rev and i have no power as it was sputtering. then it shut off again. at this point i got it towed home. got it in the garage and started it up. starts fine but wont let me rev it. after 2minutes its starts to sputter and cough and you can see the afr gauge go from 14.7 to 16.00 then to nothing and thats when the car dies. as time went on it got worse to the point where it sounds like its missing now.

its basically an all stock engine with stock ecu. only mods are q45 throttle body,front mount,BOV deleted, freddy intake and fuel pump. nothing else.

things that ive changed:
ecu-same problem
fuelpump-same problem
fuel pressure regulator-same problem
fuel filter-same problem
spark plugs-same problem
maf-same problem

i also thought it might be bad gas, so i completely drained the tank and put fresh gas in. SAME THING. it starts runs like nothing is wrong,then 2 minutes into idle it starts to cough sputter and run lean until it kills its self and turns off.

im out of ideas. the only things i havent changed is the o2 sensor,TPS,CAS,knock sensor, iacv, coil packs, and injectors. i have a set of injectors coming in and im soon to buy another set of coil packs. if that doesnt solve it i dont know what the hell to do.

can any RB series 2 experts please help. its a later model rb that uses neo coil packs,cas, and iacv. im unsure if its actually a neo being that i have side feed injectors.


i dont know how to upload videos here but if you facebook me i can send them to you there. all help is welcomed.