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Has anyone found the reason for this? I have a 2004 Mercury Mountaineer SUV and it is going dead when I slow down to about 30 or stop at lights. Very bad when on a busy street for this to happen. Was hoping to keep it for a while longer because wife is having lots of health problems and doctor bills.
Hoping this is of help to some folks. I had very similiar issues to what is mentioned in this thread. I had a Mazda MPV with a Ford Duratec V6 (2004). The issue turned out to be related to a few things. 1) I changed out my ignition coil packs. This engine gets water on the coil pack which causes a misfire due to the short circuit intermittently when the spark plugs fire and the moisture accumulate under the boot. 2) I also had the throttle body cleaned for carbon from the misfires I just mentioned. The 3rd and most important thing I believe is I replaced the Idle Air control valve. This adjusts the air for the engine at idle and can stick when there is carbon buildup in the intake manifold giving your engine too much or too little air at idle and when accelerating and cause a stall. This thing was like $50 or less at Autozone and super easy to change just 1 nut and 15 minutes. About the same work/complexity as changing a air filter.
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