I was wondering if anyone knows how to fix my gtr. When i start it up its fine, leave it to warm up its fun, but say 15 mins into driving it it starts to splutter and hesitate whenever coming on boost, like it is dropping a cylinder, then it'll drop a cylinder alltogether and run on 5. After that happens it wont rev above 2000rpm without all the cylinders cutting in and out making the whole car shudder, i have no idea what it could be. I have cleaned the afm's, changed spark plugs, the next on the list is cleaning the electric connections to the coils and temp sensor with some cleaner. Can anyone shed some light onto what might be happening? The motor has a blitz induction kit, exhaust and clutch, its pretty much stock.