Honestly, I'm not quite sure what "air temp sensor" means. I've looked up my U13 manual, there is "Mass air flow sensor", "Oxygen sensor", "EGR temperature sensor", "Coolant temp sensor" etc
Step 1
From what I can gather from your last post, assuming "Terminal 26" is inside your car (close to ECU), having 4.36V inside your car and 4.36 on the "air temp sensor" means that wiring is intact. Get a electrical contact cleaner from Jaycar (preb one with oil so that after cleaning, connector's contact dol not oxidise), give the connector a good clean. Do it for the rest of the connectors in the engine bay too. It should be part of maintenance anyway.
Step 2
Also, if the "Air temp sensor" is not within specs (assuming you measured it correctly), you should replace it anyway.
Step 3
Recap what you've touched or mod before problem occurs.
Step 4
If problem still persists, you may have other problems. Read the manual (assuming it's similar to my U13 one) "Hesitation when engine is hot" under EC section. Do a couple more diagnostics.
Is no one on the forum anymore? Anyone with suggestions, please add.