Need help!

Hi guys first post here, I have a V6 pre runner 2001 and I have my check engine light throwing a p0450 code, I would guess its the vapor pressure sensor but Im gettin a weird symptom driving on the freeway of sudden rpm drops, maybe 2-300? I just replaced the throttle position sensor so it could not be that. Unless duralast sucks that bad. I also experience rpm drop when parked at idle as well. Anyone have an idea of what it could be? Currently at 234000 miles

 

Could be vapor pressure, as the CEL diligently outlines...take care of that first.

2-300rpm can be A/C or torque converter lockup

 

yeah jm gonna guess its vapor pressure sensor. The check engine light comes on and off all the time. Ac works amazing and never have had real issues. Im just trying to find where the hell to get a vapor pressure sensor

 

Rockauto is my go-to