Debugging stumble on acceleration when warm Options

[solex]

On my past few drives the car has been stumbling when I accelerate specifically when warm and in every gear except first, in my 2.0L D-Jet in a 75'

A few of things to note:
- Ground strap at transmission has been cleaned
- Installed a second ground at battery ground point to the engine fan
- New spark plugs Bosch W175T2
- Engine compression 134-145 all cylinders
- Fuel pressure set to 28 psi
- spark plug new wires
- 123 Ignition curve 2 with vacuum advance attached, 10 degrees advance at idle
- Injectors have been rebuilt by Mr. Injector
- All vacuum hoses have been replaced
- AAR is in working order and has been oiled

Not really sure where else to look, the engine idles < 1000 but is not smooth at times jumping +/- ~ 200 RPM

Any advice would be appreciated.

[DRPHIL914]

Thank you everyone. I just removed the TPS, which I replaced a few years back (>5 I think).

I will check continuity, clean up with an eraser and then reinstall, adjust and will report back.


I started to clean up the contacts with the eraser...

Looks like the board is worn out. 914 Rubber has new boards.
Here is what a new board looks like .

i agree with all the input above andhaving been dealing with my d-jet for the past 10+ years, i'd say you are on the right track, seeing that idle change at these location sshows you have leaks that have to be addressed. with that said i would say that the TPS board you cleaned up still has an issue so glad you ordered a new one. Sometimes just cleaning it will do the job, but that looks like it was more than just oxidation but wear as well. I just had this happen again on mine. last time i did the TPS board was probably 5 years ago, and the car was doing exactly what you have happening with the bucking. Pulled my TPS with eraser and like a magic eraser, its back to normal. beatnavy and the others have said, those vac leaks will keep you from dialing this in, so just get all new seals- plenum, throttle body, intake runners etc.

once you get all that done you should be able to dial in that 123ignition distributor and set your timing and idle, and enjoy the car. Mine is now runnning like a new car, probably better than new with the 123 distributor.