Question about 2003 Mercury Mountaineer

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I have a 2003 Mercury Mountaineer Premier 8 cyl. 4.6 Litre engine with about 163.000 miles. I was riding the other day, started the truck up with no problems; kept riding for about 5 minutes and noticed that the truck wanted to stall out on me. The rpms were going from 2000 down to about 400 rpms when i was doing about 25 mph. The truck did stall out and I restarted only to have the same problem. When i come to a stop sign the rpms go down to about 400- 500 rpms and then when I stop it idles at 700 as if there were no problems. When i start moving again, the rpms surge from about 2000 rpms back down to 500 rpms. I have to put my foot on the brake and keep my foot on the gas to keep the rpms high enough for the truck not to stall out. Does anyone have any ideas on what the problem couls be?

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Posted on Jan 02, 2017

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SOURCE: car idles low, stalls after start

Common issue at the shop (i'm a ford technician), here is what I do to correct it.
Here is the most common cause of surges and stalls at stops and low erratic idle speed and rough idle, it is the idle speed control air-bypass valve and throttle valve (IAC for short), they get full of gunk 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.

Posted on Mar 11, 2009

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maps sensor

Posted on Sep 02, 2010

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