New VMP tune based on following mods. 2.3 SVT Super Charge kit/68mm pulley, Stock 3in Idler pulley, Cobra Jet Dual 65mm Throttle Body, VMP 56lb injectors, Nations 270x alternator, Kenny Bell Dual Boost a Pump, Brisk GR12S plugs/gap 28. JLT 123mm CAI, M-6312-SVT harmonic balancer, AFCO PRO dual heat exchanger w/fan, Shelby heat exchange surge tank, 170 dg thermostat, Ford Racing 3.73 Gears, 2014 carbon fiber 1 piece driveshaft, Borla tour exhaust, MGW 2 shifter, Mcloud RXT clutch, Eibach Pro suspension w/ sway bars, BMR Lower/Upper Control arms, Maximum Motorsports Caster/Camber, FAYS 2 Watts, Nations 270 alt. When doing mild pulls 2/3 gear there is a definite hesitation or better put non-linear throttle response 2,000 thru 4,000 RPM. I suspect possible vacuum leak, maybe MAS, or plug gap/coil problem. I've driven the car gingerly since new tune install and have gone through three separate tank fills of different brand 93 octane fuel. Will of course call VMP for guidance, if I cant narrow potential mechanical issue. Idle is good