Code P1443 is idle air Control (IAC) valve Speed fault
Follow the troubleshooting tree that is associated with that code.
P0402 Exhaust Gas Recirculation Flow Excessive Detected I do not recognize P1443 Instead of throwing parts at the problem, which can be many things. Take it to a professional who you trust, that has the knowledge to diagnose the problem and know what is wrong without guessing. Cheaper in the long run.
P1443 EVAP System - Tank Cap Missing Mostly it may be damaged. usually appears with code P0455
P1443 Evaporative Emission Control System - Vacuum System - Purge Control Solenoid or Purge Control Valve fault Loose or defective gas cap will cause this code.
If it is the valve on top of the fuel tank, it weel need to be replaced.
The p1443 code means a problem with the evaporative emissions system. There could be a problem with a broken or unhooked vacuum hose. Also could be a problem with the solenoid or sensor between throttle body and evaporative canister.
P1443 code evap emissions control malfuction no voltage at solenoid.
The above is copied and pasted from "The Thunderbird And Cougar Owners Club of America" "Straight from the service CD (mostly, I added a descriptor after the code) P1443=A problem with the EVAP purge flow system Continuous Memory Diagnostic Trouble Code (DTC) P1443 indicates an incorrect evaporative system purge control valve flow. Possible causes: -- Obstructed, open or cracked hoses between EVAP canister purge valve and intake manifold. -- Damaged EVAP canister purge valve. -- Damaged PF sensor."
you need to unhook your negative cable for a few that will reset>
My book shows it to mean: Evaporative purge flow sensor fault.
p1443 is an evap probleem. check hoses between evap cannister and intake manifold. look for leaks, cracks, broken, etc etc hope this helps. also type code into google and do some quick research. hope this helps. good luck . S. San Diego, Ca