Sharpie Pen

I have a 2004 Chevrolet Cavalier, 2.2 Ecotec automatic, 107,000 miles. I've searched for similar problems online that others may have had, but nothing matches my issue exactly. When the engine is cold and I'm driving under 20 mph, I get an intermittent stall. If I catch it quickly enough and hit the gas, it only hesitates and is then fine. Once it has completely stalled on me. New fuel pump @ 101,000 miles, checked IACV and it's functioning properly, and cleaned the throttle body. Next step is to check the TPS, but does anyone else have any other recommendations? I first took it to my usual mechanic, but they said there were no codes stored and nothing they could find. And of course, they could not duplicate it.

I had a hesitation between third and fourth gear, but fed my car a little injector cleaner and it cleared up.

No other issues with the vehicle. Idles fine, no power loss, no hesitation on the highway.

Forgot to mention after the vehicle stalled, it started up without issues.