Hi everyone I recently had new heads, cam, intake, plenum and throttle body installed and after driving the car around for awhile it seems to get sluggish and less reactive and the transmission doesn't seem to down shift out of overdrive. Also if I step on the gas it goes a little then starts to sputter and pop and runs like cheap. I had a new chip installed from turbo tweek for the upgrades. Does anyone have any ideas. Thanks for your help