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you can find the complete auto manual without printing it at auto zone or advance auto for about $20.00 but you can also try clearmechanic.com or webresouceful.com for a downloadable one. thank you for choosing fixya.com
I had the same problem. It was the idle air control valve. It sits on top of the intake just downstream from the throttle. There's a valve rod inside that gets worn over time and starts to stick. If that's what is causing your problem, you need to replace the unit.
1991-92 Mercury Topaz Stereo Wiring
6 1/2" Doors
Left Front (+)
Left Front (-)
Right Front (+)
Right Front (-)
6" x 9" Rear Deck
Left Rear (+)
Left Rear (-)
Right Rear (+)
Right Rear (-)