thanks for the reply Duke. Im chasing down a stalling problem while I am idling at a stop sign or coasting. But again, my real question was if there exists a throttle microswith on a 126 engine. I have already cleaned the butterfly valve and R &R the TPS. But,I do not see a microswitch on my throttle linkage and Fast Lane does not offer one for an 87 420SEL. Yet, many posters have said it exists for THEIR cars, yet no posts have specifcally said it exists on their '87 420. I had come to the conclusion that my engine does not have one.