1989 Jeep YJ no start when warm engine floods

4.2l engine has been changed from its oringinal carb
to a howell throttle body injection kit

for years it was fine. Now it will not start unless you hold the gas to the floor alowing air into the throttle
body if the engine is warm it may not start at all

when lookimg down throttle body when trying to start a much larger amount of fuel is bring dumped down it causing it to flood and not starting