What is this wire for?

[beamn7]

Make sure your base settings are good (timing, etc) then set the idle mixture screws to 3 complete turns out. Connect the dwell meter set to 6 cyl scale and allow the vehicle to reach operating temp. To make adjustments to the readings turn the idle air bleed valve in the center of the air horn of the carb. Turning clockwise leans the mixture and counterclickwise richens. The lower the reading on the dwell meter the richer the mixture is. Aim for 30 degrees but the reading will be varying back and forth. Make small adjustments and allow the mixture to stabalize each time. Go no more than 1/4 of a turn at the most each time.

If you have a throttle posistion sensor (TPS) open up the connector (with it still connected to the sensor) and check the voltage with the key on, engine off and the choke all the way off. Voltage should be checked between the middle and the bottom wires. Should be .48v for a 350. I run mine at .50v If you need to adj, there is a screw just behind the accelerator pump lever.

Hope this helps.