As I remember it was only on air cars. When the AC came on as the car sat at low idle it energized and the plunger popped out to increase the rpm's so the engine wouldn't stall.
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69 Z 302 M21 3.73
http://www.byjanmarie.com/camaro/Z28.html
69 FB 400
http://www.byjanmarie.com/firebird/69.html
69 Camaro 327 4sp. 4.10
http://www.byjanmarie.com/camaro/69camaro.html ( SOLD)
2002 Camaro LE/SLP-(sold)
1967 Nova SS-- 327, M20, 3.73, FRT Disc
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