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Sorry for the late reply but cheers for the response Michael- although the fuel pressure is fine on the FPR. So now the car isn't missing as it was after replacing the coilpack loom. Though the car is DEFINITELY still down on power, and sometimes splutters briefly then pulls when you get on boost around 4500rpm and full throttle (again, the pull isn't as hard as what it used to be). Tuner seems to think it's not the splitfire coilpacks after testing, all Injectors have been replaced, I've checked the coolant temp sensors, O2 sensors etc but yet no avail. Can anyone suggest anything else? Thanks a million guys.

Meer Motorsports, Wetherill Park. He knows his stuff!

Hey guys..just a bit of an update; Ended up taking it back to my tuner and we diagnosed that an injector was faulty and replaced it. After this, the car seemed to run fine when you weren't hitting it hard, but when I did, 1st gear would break up badly (only 1st) and every other gear didnt feel like it was hitting full boost (I don't have a boost gauge). This all happened for about a week then the misfiring during sedate driving happened all of a sudden again. Took it back and we diagnosed another faulty injector and replaced it. I got the car back today and it doesn't misfire when driving sedately, but 1st gear still breaks up hard and it doesn't feel like its hitting full boost in the other gears. Is the next step replacing coilpacks? What else could be the root of the problem from other peoples experiences, Thanks a million guys.

UPDATE: So I pulled the coolant temp sensor out (to the ECU) and the car ran fine as it should with no misfiring. I put it back in and started the car again and seemed to rev/idle as normal as well with no misfire? Is it possible that the sensor just needed to be unplugged then plugged back in? And reset itself or something? Also, I pulled out the spark plugs and they are pretty black and look like they could do with replacement plugs. @V28VX37 Thanks for your reply man- I'll have a look at your post if the problem persists.

@KiwiRS4T Sorry mate, I wasn't ignoring what you said but was just updating what had happened. I'll give it a crack tonight and report back but cheers for the support and help everyone!

Thanks for the responses everyone. But a bit of an update; drove it again today and it misfired until completely warm, where it would then normally stop misfiring once warm, but today I also noticed a slight misfire whilst driving once the car was completely warm as well? The misfire when warm is irregular but seems to be on partial throttle, but full throttle it doesnt misfire Still a coolant sensor problem possibly? Thoughts?

@Cowboy1600 Thanks man, I'll definitely consider what you suggested. I'm hoping that it isn't ECU related because I can't afford a tune! Can anyone suggest any other possible causes? As I said it misfires pretty bad until the engine is warm (or after 15 or so mins of driving). Thanks!

Hi guys, I have a series 1 r33 running spitfire coils, 1250cc injectors, walbro 460 fuel pump, gtx3076r and an Apexi fc. The car DOESNT struggle on start up/Idle, but splutters and struggles to accelerate. After 15mins or so of driving, the car suddenly runs as normal and runs like a champ. The problem all started within one day- I drove the car in the morning and it ran fine and then came back to it 2 hours after of parking and the problem started. Hasn't gotten worse or any better. I have checked the spark plugs, they all look fine. Is it a coilpack problem? Ecu problem? Sensor problem? As it runs like shit until normal engine temp. Thanks a a million guys, Any help is much appreciated.

Bump.

Bump.

Please do man. I pm'd you. Cheers

Bump. Cash waiting.

Hey guys, Looking to buy my first Skyline. Searching for a CLEAN R33 Gtst making decent power (290kw+). Preferably looking for a white series 2 R33 which is also tastefully modified on the exterior, but I'm easy if the car is right for me. My budget is around $14,000-$15,000. I'm located in Sydney but can travel within NSW for the right car. Thanks fellas. Picture for attention!