99 2.5 Cyl misfire. ( Code 0304)

[Leigh]

Been having an intermittent, "slightly" rough at idle problem since I bought the truck used two years ago.

All the spark plugs had been replaced just prior to my purchase.

I'm getting a Check Engine Code 0304, which is a #4 Cyl. misfire.

Trying to determine weather it's most likely sparkplug/s or Fuel-injector.

I would have tried swapping out the "plugs", but #4 is not the easiest to access!

I'm using a relatively inexpensive Actron CP9125 OBD ll Scanner. Would a more "sophisticated" scanner pin-point the problem?

I would think that with dual ignition/sparkplugs, sparkplug misfire would be less likely???

Best regards,
Leigh

 

[XLTsplash]

A better scanner can check your fuel trim when your engine is misfiring to tell you if it's fuel or spark related. What brand of spark plugs are you using ? And how are your plug wires ?

 

[adsm08]

Swap the plug wires across the coil and see if the code sets for cyl 2. Sounds to me like the coils are the issue.