Thanks all for the answers. For some reason, I only got one notice for the multiple replies that were posted. I have not gotten back to the car to test possibilities. With the rain coming up this weekend, testing might be further delayed. Sigh!

Based on the information above, I have a plan.
1) Clear any codes.
2) Reset the pedal position, easy to do and does no harm.
3) Pull the throttle body and clean the heck out of it. Gunk might be interfering with the flap. After inspection, I will be able see the condition on the TB. I will see if my scanner has a TB test movement test.
4) Test Drive with scanner.
5) See what happens and then make a decision on where to go based on cost.

One thing I did not mention and after reading the replies, I think might be related. At stop lights at idle the car does this brief drop in RPMs. Early when I got the car, this would happen more often. After driving it a while, the problem did seem to clear up. Recently it started coming back. So I am leaning towards the TB as my foot is on the brake and the pedal sensor should be sending the min position value. I did see a post that the TB sensor can be cleaned. See below.

New Bosch TB are ranging between 300 and 400 new. (Mercedes Throttle Body - Bosch 1131410125) This is a part I would buy new and not trust junk yard pulls.
The acceleration pedal position sensor seems to be built into the pedal and not a separate part. That part is about 375 to 450. Not cheap at all.

Reference Cross Posts:
https://www.crossfireforum.org/forum...on-sensor.html