Misfire and TPS sensor question

[Car.Fool.James]

Hi all, having some trouble with my 97 4.5 AJP Cerb with original MBE ecu.

Ive had the car 3 years, but known it 15 before. Its ran well for my 3 years, slightly rich, but well. When plugged in to the diagnostic software on the laptop, it would however always show the map on the lhs bank higher the the right with about 5% in it.

Now on 100k miles, sent it into a specialist for 12k including clearance check - did not need adjustment
When i got it back it was idling a little high, with the specialist saying it was a bit tough to set. A little lurchy lower in the revs, but when pressed felt WAY quicker -good fun. Unfortunately not long after i got it back had master cylinder failure resulting in lots of fluid drawn into the engine and smoke. Now fixed and smoke cleared by its self once burnt off, however this seems to have exaggerated the above running trouble massively.

So the issue is:
- High idle even with the idle stop completely wound out the way. (about 1250rpm), but about 25% of the time will idle more normally but cant seem to influence when it settles high vs normal.
- When idling it will miss a beat a make a bang (backfire) on the rhs drivers side exhaust (worth noting each exhaust servs each bank only - straight). Also does this misfire under partial throttle.
- Really lumpy, missing, lurchy running under part throttle. Under full load - perfect, fast, amazing, no misses.

What ive done:
- Cant get my software to connect, it finds the correct coms port, but doesn't connect. Com port it looks at changes from 1 to 3 with the usb port on the laptop. (windows 11 - Bluetooth off. USB to 9 pin cable)
- But, to try and get some headway, with it running ive doused the throttle body area in degreaser, no change to revs = no air leaks in.
- I then unplugged the throttle position sensor from the drivers side bank - cable reads "evens", which i believe to be correct - this results in no change at all to the running. I do the same to the passenger side, misfires erratically then cuts out.
- So i swapped the plugs over to the other bank. Still the misfire and backfire is on the driver side bank. I unplugged the drivers bank again whilst running, engine misfired then cut out. plug in and restart, tried the passenger bank and no change and still running.

So the misfire remains on the driver bank even with swapping the TPS leads over BUT the none effect from unplugging moves with the lead rather than staying with the sensor. To my mind this means the cable for the drivers bank TPS is faulty but still not sure as to why the misfire remains on the drivers side.

My questions:
- Do people agree with my conclusion of faulty TPS lead on the Drivers bank.
- Any suggestions RE the connection to computer - i have ordered a new lead to rule that out, will try it this week when it arrives.
- Any other thoughts, suggests etc.
-Any ideas as to why the misfire remains on the same bank (my current theory being i have 2 separate issues, one with the TPS cable, and 1 with general setup - need to connect to the computer to find out)

(Worth mentioning, happy my specialist and the work he does, nothing negative there. he is very good, but suggested if trouble persists after a good drive trying joolz - he is more equipped and experienced with this sort of issue - knows joolz would get to the root much faster. If i have no joy or it gets more involved than bolt on parts and setup i will book in with joolz but would like to exhaust my abilities first, also with peaks to the beach just a week away... i wont get in that soon)