code help

[Henn28]

My 4.6 swapped E53 has been running surprisingly well, until this am. Funny how it started right up post swap, ran fine for a few days, sat at the airport for 4 days, ran fine last night on the way home... wait for the "but..." I put INPA on it this am to review some live data, look for codes, etc. and after a bit the idle began to drop and finally it began to struggle to hold idle. It finally went into limp mode and was running extremely rough and with no throttle response.

I pulled codes with my foxwell and got three. The first two have been there since I first started it post swap and I'm sure have to do with the SAP delete I've been working on:
- EC: DME Activation intake flap
- 55: DME Activation secondary air valve

The third is new and seems like it must be the cause of the problems this am:
- 86 DME Learn function, lower stop, throttle actuator

INPA shows three codes as well:
- 236 Power stage intake valve
- 85 Secondary air valve final stage
- 134 Check lower stop

I'm not sure how the INPA codes match to the Foxwell codes, and how either match to the "P" codes that I see guys posting, but INPA "134" code seems to match up with the Foxwell "DME 86" code.

Its not like it has a carb and I can adjust the idle. But INPA says to "check lower stop faulty current" along with the following readings:
supply voltage 9.42 v
intake air temperature 15.00 deg C
Voltage DK potentiometer 10.84v
udkp1a_u 0.70V
Error present at the moment

I suppose its possible that my throttle motor failed this am, but that seems a bit coincidental. I'm thinking that I should pull the negative terminal to do a DME reset and see what happens.

Thoughts from the brain trust would be very welcome. Thanks - Brian