Mileage 187k

About 300 miles ago, I put a cam & lifters in this engine. It was a bone-stock repair using parts ordered per VIN from local dealership - no performance mods or programming.

The repair was very standard/common in terms of how things went - there was nothing about the engine that I found during tear down & cleaning/inspection that I noted as unusual or concerning.

The throttle body was pretty dirty but the plate moved freely, so I cleaned it with carb cleaner, rags & compressed air.

All appropriate ECM reset/relearn procedures were done.

I did find the VVT actuator solenoid had broken screens on it (the plastic seams of the screen had broken but the actual screens were in tact) and replaced the solenoid, but there were no other problems noted.

Engine was assembled in-vehicle using service manual per Identifix, and I had no reason to question the specs or procedures.

The initial start after the repair, and the subsequent test drives (total of 4 drives), were all very standard.

The truck ran fine for about 300 miles, then it began stalling on deceleration, particularly when exiting the highway/interstate.

There are no codes for the power train and no drive ability concerns.

I’ve already scoped the crank & cam signals during the stall and there’s nothing wrong with the signals (at least not that’s visible in the wave form).

I’ve also confirmed the torque converter clutch and VVT/MDS systems are disengaging and not stuck on.

It will stall at almost exactly 1,000 RPM every time IF the ambient temperature is approx. 50*F or warmer. At lower temps, the stalling is not as consistent, but will still occur if driven for longer periods on the highway.

The stalling can be prevented by tapping on the accelerator pedal or by shifting to neutral.

I’ve already checked & tested several other components/wiring/etc. but no luck.

As always, thank you.