well,
befor the car was stuttering only in high rpms and under load in 4th it was bucking.{only when the motor was heated up}

now,,it is sputtering through out the whole rpm range and almost stalling........runs great when engine is cold

ive just changed..plugs , wires, zo6 maf, coil, o2s, thermostat .. and nothing worked, please help
thanks
josh

 

I would think opti because it sounds like my old one way back when.