hi i have a misfire at full throttle when driving in 1st gear full throttle no misfire 2nd 3rd 4th 5th 6th full throttle at around 2800rpm to 3000rpm i hear popping from the intake and hesitation then it is okay after that then pulls up to redline if i press accelerator slowly then it wont misfire/hesitate sparkplugs and coil packs have been changed there is no codes when checked all help appreciated