To start off, no codes have been kicked. Its started awhile ago, acked like the truck was miss firing under acceleration. Changed plugs, wires, cap and rotor. smoothed idle a little bit problem was still there. it was fine crusin at 55mph, but when i would get on the gas just enough to start pullin boost it would run rough. like major miss fire, shakes and rattles the truck. Also would get a gas smell in the cab. Just today tho, it pretty much stutters and shakes at 30+ mph. My thought is maybe a injector going bad or fuel pump. but im not a mechanic. Need help please!! Truck is stock, does have aftermarket exhaust, K&N, and i believe a hypertech chip with sucks. It wont let me do over 100mph at WOT. Could it be the chip??