The microswitch is just there to provide an idle throttle position signal for idle control and fuel shutoff on decel.
This won't give an effect of a general rough engine running. What are your symptoms?
A simple check of the switch is to check for an open/closed circuit when the switch is open/closed.
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Alex.
MB Tech
Sydney, Australia
Volvo 122S
W201 190D 2.5 manual
W202 C240
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