I can be driving down the road and the explorer dies like it does not idle high enough, I have replaced serpentine belt, o2 sensors, fuel filter, and spark plugs. Explorer will not stay running unless you have foot on gas, again like it does not idle high enough. This is not a constant problem, it comes and goes.
My 99 Explorer would not run unless you held the pedal to the floor. Found out ford has a recall on their intake gaskets. If you see what the intake gaskets look like you'll wonder how the motor runs at all. I had that prob for 50,000 miles and I changed those gaskets and now it runs like a new ford.
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clean the intake with a good quality intake cleaner. A carb cleaner that will not hurt plastic parts.After that let it cool, take some of the carb spray and clean the o2 sensors ,let dry,wipe the o2 sensors down with a clean cloth.replace them in there sockets.Remove one battery post for about 15 minutes.It should run better.The o2 cleaning should last only temperarely and the o2s will eventually have to be changed.you may want to check to see if you have a fuel filter and change it as well
Most common cause is a internally plugged radiator. The water and coolant often react negatively to the metals and rubber inside the passageways to clog the radiator over time. If you wish to try to "reverse flush " it yourself, ask "fixya". Other causes may be: Stuck thermostat, plugged fins of radiator outside, water pump slipping or starting to fail by "freezing up", loose or slipping serpentine belt, and problem with the engine cooling fan.
The O2 sensor answers the idle problem. The vibration could be motor mounts, bushings in the sway bar or even tie rod ends or a bad strut. If the vibration is only there when moving it's not the motor mounts but the rest are still suspect.
Find the EGR valve on the intake and locate the vacuum hose that is connected to it. Start the engine cold and as it warms up, pull the hose off and if it idles and drives fine, the EGR valve is bad and needs to be replaced. Please rate me on this answer.
First thing i would check would be the fuel filter. Sometimes, when they first start to give problems, there is enough gas to keep them idling or driving around town, but when you get on the highway they starve for fuel.
Idle air control motor located where the duct from your breather attaches to you intake, two bolts and a plug, probably has what looks like a black button on it. This is a very common problem on all fords.