keith,
you are just feeling the backlash in the tranny when you let off the gas. With the mod, the engine responds much more quickly to your foot as you pull off the pedal. This causes the car to 'buck' a little, which is a not-uncommon complaint. Just open up the hole in the cap a little more, that should solve your problem... It will slow down the motor's reaction to the sudden throttle closing. Good Luck
flyer
