I assume when it stalls it doesn’t give you an error code when you try to pull DTCs using an OBD reader? If so then it’s 98% of the time indeed the mechanical 2-speed fuel pump of the 06/07 models. If there’s an error, and typically it’s related to a misfire, then it is the coil pack that is the...
It’s been a few years now and a handful of 100°F outside air temps instances that I drove my 06. After 3 yrs, 80mph interstate drives or slow crawl in the trails and the fuel pump I used hasn’t skipped a beat.
For that mileage and no history of the pump not being replaced, I think your factory fuel pump lasted longer than mine. Mine showed deteriorated symptoms at 230k miles (2 years socal truck, 9 yrs Houston TX truck, 4 yrs and counting Las Vegas NV truck).
Okay. Reason I asked is with the similar OAT (outside air temp), I had the same experience.
OAT 97°F, humidity 8%, coolant temp 200°F (real-time reading on the OBD Fusion wireless app) I had the same stalling issues. I have an 06 VVTi 2UZFE as well. And replacing the fuel pump with part number...