S1 PTP165 TPS reset

[f-d]

After a long time my knowledge has decayed :

I have an S1 with a PTP 165 conversion, EFI Euro 1 ECU (came with the kit), plus the rest of the kit out of a box.

Has run for many years perfectly.

Now will not idle at a sane speed, idles at 1500-2500. starts easily.

I have swapped brown temp sensor, tps, iacv with known good ones, no change. Throttle is metal and not sticking (moving to both stops as expected).

I've belled out all the hoses and the plenum pressure hose, no leaks.

Is there a reset process for this ECU/Kit for the TPS that anybody knows ?

I've tried pulling the battery, no change.

Any clues appreciated.