So I have a 2004 G35 sedan 5at and one night I filled in gas to full tank, I always filled up fill at 1/4 tank same gas station. About 40 mins into driving I noticed when I accelerated from a stop there would be a hesitation the the rpm would jump up to where it should be almost like the injectors is clogged?

So I changed the fuel pump it helped a little, changed spark plugs, crank, alternator sensor, cleaned throttle body and MAF also switched with another MAF that I know is working. So everytime I start the car and let it idle at around 40 minutes it will start to run rough and it will die unless give it gas, does this constantly. I haven't ran injector cleaner yet I'm wondering before I buy new injectors should I check anything else first?

 

be sure to check there are no leaks after the MAF and before the O2 sensor.

any mods?

 

Z tube and plenum space, I forgot to add that I retorqued the plenum bolts and have no air leaks. Which o2 sensor should I look at the top or near the cats