Duratec 24V or 12V Vulcan engine? What did you mean by "yet"? Even if the light is off, there can still be codes stored in the computer. May even be a blown out bulb, you never know. But you should go down to Auto Zone and have it plugged in. I'm pretty sure it is free. Have you tried running some fuel additive/cleaner, dry gas, high octane fuel, or all? Worth a shot. Let me know.

 

Hey Conan,

Sorry it's been a few days/weeks to get back to you. Was in the hospital for a few days then just been busy getting caught up with everything. I used a code reader at Auto Zone and it said that cylinder 1 is mis-firing. The thing is, I just had all the plugs and wires replaced no more than 1K miles ago. Bad plug? I'm planning on changing the plug myself tomorrow to see what happens. Hope this will solve it.

 

The plug is the cheapest way to start but probably at the bottom of the list of culprits.

 

should probably make sure the wires haven't wiggled loose. since you just changed them all, that may be why.

 

With my luck I'm guessing it probably won't be.

Dumb question, but where is cylinder 1? I'm hoping it's on the topside because I've heard the ones on the underside are a pain to get at.

 

cyl 1 is usually the one nearest the belts on the radiator side of the engine. check the wires to the plugs and make sure they're actually connected good and not just set on the plugs. (might even pull them off and put them back on) and make sure they're connected well at the coil(s).