Have you tried letting the motor stagger along for a few minutes when it's mucking up at idle and then killing it and doing a plug reading? That might tell you if it's misfiring because of being too lean or too rich, which in turn could indicate whether you're looking at higher or lower resistance in the cable run sending the throttle point information to the ECU. TPS resistance decreases as the throttle opens. If it's too lean at idle it would mean too much resistance in that cable run, so too low a voltage input to the ECU causing too little fuel to be injected. so suggests loose connection or a frayed point in that wire.
Well to be completely honest only the last two lines make any sense to me mate.
If I can't find it by Tuesday arvo, and I'm just getting home in the Benz at 1.17am from a full on 6 hours of psychedelic rock music from a couple of my favourite bands, Rinser, and Emu, check out Emu man,they're from up your way, Henry, the drummer from Zong also plays drums with Emu and the singer just slays it on heavy blues lead,
I got some vid footage from down in the moshpit for ASTRODEATH,
Still got it ringing in my ears!
Then they did Black Sabbath "Children of the Grave!"....the mosh was going off! You woulda been proud of me!
Now Sunday so this arvo Rose Tattoo ⚡are playing at Wallabys Pub in Mudgeeraba and I have a ticket👍🇦🇺....
So being realistic I won't get a look at the wires till Monday.
Now if I ain't got it pegged by Tuesday arvo there's a German bloke I know from my old drinking days(daze) who coincidentally rides a wicked chopped knucklehead, he's an electrical whiz with old stuff.
He's never had nothing to do with Victorys, or fuel injection, or ECU/ECM ,
But as said to him when I rang him and dredged him up from my dark past.
It's only wires!
We looking for a short!
Maybe you might like to ride on down too if you're free.
I'll give you a call tomorrow when I wake up.
This bloody old Benz is a joy to drive hey, I love it!
Must be getting old........