Looking at the MPC and shop manual it looks like the application for those solenoids was a mix of idle stop and AC,
In 69 only the RAIV and sprints used an electric solenoid and it was for idle stop. Transmission played no role in application.
In 68 idle stop electric solenoids seem to have been used on all engines and transmissions across all models.
In 67 (and many earlier cars) an anti stall vacuum device was used on Many automatic cars to prevent stalling on sudden throttle let up. It temporarily raised the idle backstop position so the engine wouldn’t stall when you suddenly lifted your foot off the gas. 6cyl AC cars used the below device instead...
Also in 67 and earlier there was an electric speed up control (in effect a solenoid) used on 6 cal AC cars. The difference with this device is it was electric actuated but vacuum controlled. It raised the idle when the AC was on under low vacuum (high load) conditions . It was used on most 61-67 4 and 6 cal engines with AC..
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My Break Away Squad
1969 Fbird (Base, 350 & Sprint Cvt’s - 400HO & TA Hardtops)
1969 LeMans (2dr & 4dr Hardtop and a Cvt)
1969 LeMans Safari 2 seat Wagon
1969 GTO (2 Cvt, 2 Hardtops & Judge Hardtop)
1969 Catalina (3 Cvt’s & a 2dr hardtop)
1969 Ventura 2 Seat Wagon
1969 Executive 4dr Sedan
1969 Bonnie Cvt
1969 Bonnie 3 Seat Wagon (2 of them)
1969 Bonnie Brougham (4dr Hardtop & Cvt)
1969 Grand Prix SJ (2 of them)
1969 2+2 2dr Hardtop (Canadian model)
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