Welcome to Just Commodores, a site specifically designed for all people who share the same passion as yourself.
Geez, seems like you have a bad case of the Gremlins on that Ute.
Is anoying (to see on my side) that you are getting all this drama after spending that much coin.
I would help from here but not sure if a 3800 TPS from the US cars is going to work. Even if they look the same, the values might be different. I would if I you were at driving distance.
Series 2 vt. 5.7 litre v8.not sure about when they started OBD 2 in LS
The later model L36 or 3800 V6 series 2 (ecotec to us) engines use a reverse rotation TPS, looks the same, same plug etc but opposite orientation. The earlier 3800 V6 uses a different TB to us so I'm not 100% sure if they are compatible but they are a GM sensor so no doubt there would be an equivalent unit on GM engines.
Our V6 motors use ALDL but use the OBD2 plug from VR onward.
So would we all but, we are all too tight to buy them, probably why they no longer exist hence why lots of us brought new cars. If I could still buy old oem parts, Id still drive my HZ tonner and my vk but they both ended up with the similar problems your are having now. Aftermarket parts Id replaced failing weekly.