You need to remove the throttle body with switch to adjust it, trust me
on this, and have a set of metric allen wrenches ready, I don't  know
the size.

Check it first with an ohm meter before you go to the trouble though.
If you have good hearing you can hear the click at full throttle and
closed throttle as you move the linkage.
--
Stuart MacMillan
Seattle

'84 Vanagon Westfalia w/2.1
'65 MGB (Daily driver since 1969)
'74 MGB GT (Restoring sloooowly)

Assisting on Restoration (and spending OPM):
'72 MGB GT (Daughter's)
'64 MGB (Son's)

Stripped and gone but their parts live on:
'68 MGB, '73 MGB, '67 MGB GT