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Got the same issue here as well. It means that you have a misfire in #4 cylinder. Most likely it is the plug and coil in the #4 position due to leaking coolant from the heater core. Check to see if there is indeed coolant, if so when you change out the coil and plug you will want to replace the hose clamp just above the plug with a "screw to tighten" one.
What else can I help you with?
2001 ford explorer sport diagnostic codes P0304?
the code p0304 is cylinder 4 misfire detected
Dodge caravan 2001 eng code p0304?
Trouble code P0304 means:Cylinder 4 misfire detected
What is p1507 error code to an 2001 expedition?
Trouble code P1507 means: Idle air control (IAC) underspeed error
What causes the abs dashboard light to appear in a 2001 expedition?
light sensor
What causes my 2001 Expedition fuse 15 to blow every time I replace it?
There is a electrical short somewhere...
What causes a Chrysler Sebring 2001 deck error message?
The trunk is open or the ajar switch has malfunctioned.
Where is the speed sensor on a 2001 Ford Expedition?
Speed sensor on a 2001 ford expedition
What size engine does the 2001 Ford Expedition have?
The 2001 Ford Expedition has a V8 engine.
How many valves does the 2001 Ford Expedition have?
The 2001 Ford Expedition has 16 valves.
What type of freon do you put in a 2001 Ford Expedition?
r134a for a 2001 Ford Expedition
How do you change spark plugs on 2001 ford expedition?
how to change spark plugs on a 2001 expedition
What kind of transmission does the 2001 Ford Expedition have?
The 2001 Ford Expedition has a 4-speed automatic.
