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Q:

floods at idle on 1994 Ford F-350

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
will not power up scanner. floods at idle. back fires. run roughs.
(1) Answer
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Check for power and ground at the OBD2 connector
http://www.obdii.com/connector.html
Check that pins at the connector are fully seated in the OBD2 socket. Once the scan tool can communicate with the computer in your car it wil likely show the area the problem is related to.