Rx7aholic

iTrader: (22)

Hey guys i always notice a little of hesitation on my car in all gears on heavy throttle i need to know why does it do that? And what i can do clear completly from doing it again? Also these are my mods, aftermarket -downpipe, hks turbo catback, Rx7 fashion intake, M2 stage 3 ecu set @ 12 lbs. Also i still have the main cat. Also it never brother me before but everytime on the Hi-way and floor it in 3rd the car start to hesitate and it's now starting to **** me off because i want it to run like beast. please any info would greatly help, also i do have a pettit gronded strap add to the car.