Throttle position switch. You can see the idle switch which is a sealed micro switch (left) and the WOT switch with the open contacts. Many times this WOT switch fails of fails intermittently, maybe due lo little use (not many WOT situations) or the open construction.
Hella makes this part (6PX008476-01) for quite a few brands:
The Bosch number is 0280 120 322, and the Hella number is 6PX 008476-011.
(THROTTLE POSITION SWITCH)
MADE BY HUCO
PART NO...13 8502