P1443 - Evaporative Emissions System Control Valve
This is related to the emissions system, and the Purge Control Valve is either failing, plugged or the vacuum lines are plugged/disconnected.
Here is some info about what the Purge Valve is and how it works.
...and degrades to 40 MPH and unable to speed up unless throttle is lighty touched. Codes pulled, P1443, P0420 and P1131, lack of Heated O2 switch 1, Evac vacuum system purge or VMV fault, cat syste...