I have a 2001 F150 4.6 and I replaced the TPS, PVC valve and a mass air flow sensor and I still have a high idle for 1to 4 sec after I lift off the accelerator can anyone guide me in the correction please

 

Sound like you might have a vacuum leak. Try getting an unlit propane torch and see what that does to the engine. Try putting it around the vacuum hoses. If the idle changes, you know that you have to inspect a little closer.

 

Clean or replace the IAC. Clean the throttle body. Check for OBD2 codes.