1998 frod windstar wont stay running when first started

my van starts and runs like a dream, aside from a little rattling noise, after it sits for at least an hour. The problem is after i park the van from going somewhere, if I try to start it again within an hour after i turn it off it will stall seconds after it starts and will keep doing so unles I slowly tap the gas and continuously rev the engine for about 30 seconds or so. I have noticed that there is some oil getting into the air filter housing, dont think that is normal but not sure. Also according to the vin# it says the engine is a 3.8, but according to diagrams and specs i have found as far as the pcv valve, it is located in the position of a 3.0 engine. again, not sure if they are located in the same spot but other sources said the pcv is located on the rear of engine on the passenger side on a 3.8 and located in the middle of the rear engine on a 3.0. Any help would b appreciated. Oh yeah, the service engine light is on and Autozone read the codes and they are P0153, P0171, and P0174.