Some may be familiar with my 89 F150 XLT Lariat extended cab some may not , so early on I noticed that when revved white smoke is coming directly from the throttle body on the truck what should I be suspicious of and looking at??? Pcv or intake plenum gasket if none of the above then what should I be looking for???

 

Well, coolant runs through the throttle body. So try bypassing the lines and see if it still does it. It's the fastest thing you can try and its free.