RB25DET Popping and shaking

[NzPeasant]

Hello Genies,
I need help,

I have an r33 RB25det series 2 Manual.
After driving for 30 minutes the car begins to stutter hard unless i feather the throttle real soft will feel like it's missing.
If I floor it in neutral it bounces from 3k revs up to 4k and won't hit redline. Feels like the engine is rocking a bit but that's probably because I am trying to rev the balls off it 
When driving once it hits 3 k revs the car will start bouncing back and forwards hard and a popping noise will come from the exhaust like it's running rich. This will happen under any moderate or hard acceleration.

If I turn the car off and turn it back on a few minutes later the problem is fixed and the car will run great for the next couple of minutes then the popping and stuttering will resume.

The car drives great when it hasn't been driving for over 30 minutes will hit redline.

I have new NGK iridium plugs -11
And New Osaka Coil Packs which has helped it stutter less
I have re soldered and cleaned the MAF
I ran the ECU got code 33, Heated Oxygen Sensor, I cleaned it put back in. Code hasn't come back also running without o2 still won't rev up

Rescanned got code 44 for ECCS working correctly.

 

[NzPeasant]

Any help appreciated 

[NzPeasant]

Pic of my car for reference

[KiwiRS4T]

Fuel pump. Pull the fuel line off and measure the flow or stick a pressure gauge on it.

O2 sensor should probably be replaced but it won't be the cause of your problem.

[niZmO_Man]

Are you running factory boost? Checked the condition of the spark plug tips?

[NzPeasant]

Hey thanks for ur guys replys i tried check fuel pump pressure but couldn't figure out how to do it, 

Car is fully stock pulled out the sparkplugs have yellow on the tips and the metal screw in part it black, gave them all a clean with break cleaner the stutter persists 

They only have about 1500 kms on them 

 

[NzPeasant]

Hey am going for a car scan on Friday to diagnose the problem, I will get back and let everyone know what the problem is in case anyone else has this problem thx

[GTSBoy]

  On 06/08/2018 at 5:11 AM, NzPeasant said:

i tried check fuel pump pressure but couldn't figure out how to do it

Expand  

'seasy.  Just tee a fuel pressure gauge into the line before the fuel rail.

[KiwiRS4T]

  On 07/08/2018 at 10:09 AM, NzPeasant said:

Hey am going for a car scan on Friday to diagnose the problem, I will get back and let everyone know what the problem is in case anyone else has this problem thx

Expand  

Do that ! Where are you taking it as a matter of interest?

[NzPeasant]

Not a bad idea will tee in a fuel pressure guage Ty

Also taking it to a random mechanic shop in Auckland that said they could scan obd1 lol 

Will let u guys know the results 

Vid attached is me flooring car in neutral revved to 4k the first time I did it 

[Pastechi]

i have a feeling i have a similar issue...with my case my sound just turns into a gruggling sound after 30minutes but the car idle's at perfect 1.1k rpm. The meters are still find, the whiteband reading fine. I don't know...
Some say that i am using water and no antifreeze coolant, causing things to become hot in the radiator and cause bubble. Some say its the thermostat and some say its a blown headgasket.
I know it's not the sparkplugs because i gave the car a service 10days ago with fresh v-power 7 sparkplugs, oil and oilfilter

[NzPeasant]

Maybe you have air in your system might need to bleed the system

Took mine to the shop to get it scanned code 55 meaning all good

I fixed mine by Spraying all ground connections and connectors with AFM cleaner 

hasn't come back since