Air/fuel mixture adjustment on the 88 90q

[Lino M. Valadas]

Guys,

I usually use a dwell meter to adjust the air/fuel mixture on the I5's using
the test connector under the hood, but my son's 88 90q does not appear to
have this connector.  I'm at a loss on how to adjust the air/fuel mixture
and the car does not pass emissions at idle.  It is Ok at higher revs but
not at idle, too rich.  How do you guys adjust the air/fuel mixture on this
car??

TIA

Lino