2000 mustang gt - brand new rebuilt 4.6 modular 16 valve engine - vortec supercharger for stock application 4.6 motor - long tube headers - off road x-pipe - no cats...I've replaced the flwg: new plugs - gapped at 38 - new accel coils - new fuel pump - cleaned gas tank - new fuel filter - new fuel pressure censor - new throttle position censor... car is still bucking intermittently -most consistent when going aroundright hand turns... No check engine light is coming on - Took to repair shop - they could not pull codes.. - Should i takeit to the Performance shop who tuned my car ?? do you think they can pull codes??? Any suggestions on what this may be ??? - Pls help !!! Thanks