Engine stalling issue at low speeds This problem
is commonly caused by a dirty automatic idle speed control valve and
throttle valve. Buy a can of throttle valve cleaner from NAPA or
Carquest (made by CRC chemicals) and spray it into the air intake
while the engine is running, use up about 1/2 the can, engine will
try to stall hold the speed up, shut it down and let it soak for 30
minutes, restart and blow out the remaining fluid, shut it down and
disconnect the negative battery cable for 5 Min's to reset the base
idle control
SOURCE: 1999 Ford Escort idle problems
you need to look for a vacume leak thsi would also make your IAC valve go beyond range.good luck
SOURCE: engine lopes while idling or idles erratically
vaccum hose back of intake manifold, check elbow rubber fitting for any cracks.
SOURCE: Very Rough Idle and sometimes cuts off while idling
sounds like bad Idle Air control valve Not Cheap
SOURCE: 2000 Lincoln Navigator with rough idling and service engine light
i had the same trouble, there is a rubber boot under the cover on the top of the motor, it is coming from the egr valve, takes about 5 mins to repair and less than 5 dollars.
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