set up: LSVTEC b16/b18 chippd p28. my car start up fine and runs good on idle, but when you press the gas it sputter around 2k n up ( sound like subby engines or running on 3 cylinders. Ive changed out my caps, rotor, wires, dizzy, fuel filter, spark plugs all have sparks, getting 43 psi on my fuel press. set timing plenty of times n checked with advance timing light n its on point. no cel code. checkd my injectors n all has voltages and resistant check is good. please i really need some help, thanks...

 

so i checked the combustion chamber and #1, 2 & 3 has black chamber and #4 was clean, like ders no mixture going on. any idea please help me out..thanks

 

fixed. #4 injector was clogged. sprayed it with brake cleaner and now its fixed.....