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What is the name of the wire that connects the speedometer to the transmition

Help, I have a 2005 mercury monterey that had code p0401 on it. I cleaned the EGR valve with carb cleaner and reset code by disconnecting negative battery cable to battery.  I connected everything back up, code went away and now 2 weeks later I am getting horrible gas mileage.  Why? thanks.

I have tried to open the bleed valve and compressing but this did not help?

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When I start to slow down, the vehicle starts jumping like its hung in high gear and I have to press the o/d off button on my gear shift to stop it. Also,while driving down the road, when I let up on the accelerator the transmission starts jumping.

Response:

One of the solenoids or valves in the transmission’s valve body is hanging up . Look at the fluid color ( wipe stick off on white paper) if it is brown instead of bright pink, you can try a filter and fluid service ( make sure to use Mercon V this is full synthetic fluid required in this vehicle) . If the fluid is pretty pink you can try putting an additive called ” Shudder Fix ” ( can be found at auto parts store ) this may be a good thing to try before tearing apart the transmission. You may want to check the  VSS ( vehicle speed sensor to make sure it is sending the proper signals ) also before tearing it apart.Feel free to check out some of the other resources on the website as there may be some helpful information available.