1993 Ford Explorer idles rough when engine is warm

Several things can cause rough idle on a Ford.

Check all vacuum hoses for, first of all, that they are there, and then that they have not been chewed by mice or squirrels (that happens), or rotted away (that happens too).

Check the coil pack(s) for corrosion at spark plug terminals, check plug wires--at night, the darker the better, raise hood with engine running; blue sparks or lightning jumping around the wires and plugs means your wires are dead--check plugs for fouling or tip wear, if your car has over 100,000 miles check catalytic converter and fuel filter, and check the TPS. The throttle position sensor monitors where the gas pedal is, and since most of the time, it is at the place that makes the car go 55, or idle, the TPS can get worn in those positions and send false signals to the PCM. Fords of that vintage also used a pulsed air feeder that can cause rough idle and is very difficult to service.

Best bet is vacuum leak first, then spark, then fuel, then the out-there stuff.

Rough on idle when the engine is warm means there are many areas to be checked and it can start with the ECM , the fuel pump and more likely the sensors, check the throttle valve, the camsensor which can be set off which might need a correction. Also the vacuum feed for auto advance needs to checked.

You need to check your plug wires for cracks and wear. The best way to know if they are bad is to run your engine at nightr and look for any time of blue arcing spark coming from any of the wires. I believe that replacing the wires will solve your problem.

I Have a 1999 ford f150 4.6 that back fires and is just running really ruff when idling alot of nack fire a sord of like a pulse going on what is my problem?

i would think a plugged fuel injector on # 6 cylinder could be the problem,or a big vacuum leak at that cylinder
a valve burnt/stuck could be but you dont see much of that anymore
could be coolant leaking into cylinder from leaky haed gasket but you would have to add coolant every so often
i would check #6 cyl. spark plug after driveing around a while if it looks new, ie no deposits on it then an injector would be what i would change next

change fuel filter, check fuel preasure,spark plugs,spark plug wires, air filter , tps. (throttle position sensor)

Try running some fuel injector cleaner through your fuel tank. What you may have are a couple of plugged or missfiring fuel injectors. I would suggest checking all of your wiring to your injectors to insure good connection, replace your fuel filter and check for vacuum leaks.

You replace alot of things but you should replace the EGR valve and the throttle positioning valve also. I would start with the EGR valve

sounds like bad Idle Air control valve Not Cheap

How long have you had this problem? It could just be a bad tank of gas. Other things to check:
1. fuel pump and filter
Could be running on only 5 cylinders due to
2. spark plugs/wires
3. plugged fuel injector
Any problems with electrical? Like lights dimming at same time as running rough?
4. could be bad alternator putting excessive load on engine.