Idles High, Shifts in gear hadr
IAC Idle Air Control valve bad or severe vacuum leak.
Usually it is a vacuum leak which is letting more air into the engine. With engine running, use a spray water bottle and mist around all vacuum lines, the power brake booster and engine seams. Then try any vacuum line to the transmission. Could also be a burst vacuum shift diaphram if so equipped.
SOURCE: What Can I Do About a Rough Idle on a 1999 Mercury Villager?
Check the timing, PCV, fuel filter, clean out the throttle body, air intake, and check the Exhaust gas recirculation system. Valve and all.
SOURCE: 1999 mercury villager brakes lights
check the brake light switch. It could be defective and it costs less than $30 and easy to replace. Buy an OEM from the dealer instead of a $10 one from the auto parts store. It is located above the brake pedal.
SOURCE: High engine idle 94 Mercury Cougar
replace throttle body gasket. first check to see if carbon has built up around the throttle valves in throttle body if so remove and clean it with throttle body cleaner.and a old tooth brush. besure to remove all electrical components or any thing that plastic or rubber the cleaner will destroy it.
SOURCE: 1999 MERCURY VILLAGER fuel pump location
The mechanical fuel pump is located on the engine block or on the cylinder head.
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Here are the most common causes of idle surge, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake
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