fuel overloading

I have a 93 chevy truck 350 engine, after engine warms up, usually after 8-10 minutes, will start to overload with fuel. First few minutes of morning great,
but rest of day is not fun.Had friend use handheld diagnostic machine. All operations check ok. Thanks in advance for any help.
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Sounds like either the oxygen sensor or the water temperature sensor. In the morning when the motor isn't to operating temperature the engine can stand a rich mixture. As the motor warms up if the computer doesn't get the true readings of the motor you may be getting a rich mixture.
HTH Brian

8-10 minutes, will start to overload with fuel. First few minutes of morning great, but rest of day is not fun.Had friend use handheld diagnostic machine. All operations check ok. Thanks in advance for any help.

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