First you have to check for vacuum leaks. Then check vacuum motor/pod operation, solder joint problems in the CC buttons and finally replace any vacuum motors that are bad, which may just be the double acting one burried in the dash.

You might get user 'thomaspins' subscription because be has the complete procedures for this.

__________________
Regards

Warren

Currently 1965 220Sb, 2002 FORD Crown Vic Police Interceptor

Had 1965 220SEb, 1967 230S, 280SE 4.5, 300SE (W126), 420SEL

ENTER > = (HP RPN)

Not part of the in-crowd since 1952.