New Fuel Injectors Chasing Previa SC P0171 Lean Code To The Cylinder Head Side After Head Gasket

Nearly 3,200 miles after replacing the head gasket on our 1994 Toyota Previa LE SC AllTrac we are still getting a recurring P0171 Fuel System Lean code intermittently. I have not found any vacuum / air leaks on the instake manifold (driver side) so we are now heading back to the cylinder head (passenger side) replacing the Toyota OEM Fuel Injectors and looking for any possible vacuum / air leaks along the way.
Thumbnail Title: Previa Fuel Injectors
Car: 1994 Toyota Previa LE SC AllTrac
Music: "Oaxacon Tradition" by Jimena Contreras (RUclips Music Library)
‪@jamiecars‬

[@Liazon098]

I find it so fun how you drive with a OBD2 reader!
Have you ever tried a smoke machine???

[@jamiecars]

No. Not all the time - just curious watching fuel trims while it was throwing P0171 lean condition recently. Starting to feel I fixed it this time...

[@30kendel]

Where do you get or buy your books or manuals??

[@jamiecars]

Bought them as a set from eBay - they are year and N/A v SC specific. I've sent them on local Craigslist occasionally too.