Hi,
The idle air control (IAC). Mounted close to the throttle body.
Condensation
Lack of oil lubrication to lifters
What causes back firing on a ford explorer and it to idle rough and want to cut out when you try to give it gas.
The engine
The #1 cause of hard starting a 1991 ford explorer is having lost your keys
My 1995 Ford Explorer was running cooler on the temperature gauge and it turned out to be my thermostat
Muscle spasm
modulator valve on the transmission.
warped rotors change them and it should be fine
I have a 1995 Explorer Limited with air ride struts. The noise I found was of the drivers side strut. Needed replacement.
"I have a 2003 Ford Explorer, the original owner. When it rains, the passenger side carpeting gets soaked. What causes this? I do have a moon roof."
i don't know if this is exactly an answer but I've noticed mine does that on cold mornings (around 32 degrees)