ruff idills at a light bogs down when driving smell gas some times and puts out white smoke when acts up.

i have a 2001 chevy blazier that ruff idills at a light bogs down when driving smell gas some times and puts out white smoke when acts up. check enige light is on and it will flash when it acts up.codes are P0200.P0122,P0452,P0304 replaced the dist cap, rotor, wires are good plug are good pulled the thortle body to check for spray did not see any thing please help