My friend recently bought Nology Hotwires for his Sentra and has been having problems with it. Whenever he floors his pedal, the car chugs like it's not getting enough gas or something, almost like when you first learned how to drive stick and couldn't control the clutch and gas causing the car to buck from fast to slow real quick. What could be the problem with his car? We're positive his wires were put on correctly, I doubt it requires the help of a professional mechanic; switch wires correctly, attach to a ground, the end. Then again in the Nology box there were 5 sets of wires, 4 were the red spark plug wires he ordered, and there was this 1 black one that we had no clue was for and wasn't mentioned in the instructions as well so we just ignored it. We talked to some nobody mechanic about this and he suggested we check our timing. I'm really interested in knowing whether the wires work or are just for looks but its impossible when he can't even accelerate as fast as he can. Then again 170 bucks for wires for the 1-2hp and ft/lbs of torque they supposedly give hardly sounds like a reasonable investment. Please help, thanks in advance.