I have a 2001 impala 3.8 motor that keeps cutting off either while driving or j can be parked i replaced fuel pump fuel filter thermostat idle control valve and cold air intake hose and i did a tune up but it still cuts off any idea what it may be

well, rather than guess, have a pro road test it and check live and mode 6 data with his scan tool. But often computer failures on that model

Yea ve took it to 3 mechanics and still nothing and no codes are coming up