Backfiring at high RPM's HELP!!!! (Hesitation)

[Turboed89]

Ok here's my problem...My car runs fine, drives fine maybe a little hesitation but nothing that seemed to be a huge problem....My car basically when im on the gas and the rpms get to 6,000 my car starts to backfire like crazy and bog and have no power....Im running stock boost, intake, 3-inch exhaust, Hi-pressure fuel pump, and thats it....it was doing the same thing at 3,000rpms before but that was because the intake inlet to the throttle body was disconnected a little but fixed it now this...so thats where im at, any help would be awsome...thanks

[9240sx]

Id check for boost leaks,And check the Spark plug gap,Timing,And fuel filter.

[biglipzit]

someone has a high speed miss.... I say at WOT either a coil is giving up or spark plug is giving up. Check the spark gaps for sure i had that problem and spark gaps were to blame. .8mm it should be. Goodluck.

[912.0turbo]

Id check for boost leaks,And check the Spark plug gap,Timing,And fuel filter.

I'm gonna go with 9240sx on this one. I had a similar problem for months and then one day decided to tighten my hotpipe and it went away.

[Turboed89]

i have a 300zx fuel filter and new spark plugs and the timings good....

[biglipzit]

you still may have to regap new spark plugs u know. They dont all just come preset for you.

[Turboed89]

yeah i know i gapped em'

you still may have to regap new spark plugs u know. They dont all just come preset for you.

[912.0turbo]

I would definitley go over your intercooler pipes. I would take them off and put it all back together. It may take a while but you'll know for sure if its a boost leak.

[PMRacing532]

Do you have an adjustable fuel pressure regulator? I had the same misfiring/stuttering problem on my car. Walbro fuel pump and Z32 fuel filter did not fix it. My mech looked at my plugs and said I was running lean (have u looked at your plugs?) I installed a Nismo Adj fuel pressure regulator and that did the trick.