[cardoc]

A misfire can be caused by lack of fuel or a vacuum leak also. When was the last time you replaced the fuel filter? Checked for vacuum leaks? Crack in the intake tube after the MAF?

If fuel and vacuum check out, try a new PCV valve and recheck your wires. It is possible for a coil to lose one cylinder sporadically. If you have or can get a spark tester and install it inline between the wire and #4 plug, it will give you an indication of fire from the coil.

 

[justaguy93]

Thanks for the reply. I will check those things out. Do you have any tips for testing vacuum lines? That's not something I have any experience with yet.

 

[cardoc]

Easy way to do it in your driveway is to use something like "brake cleaner" that is flamable and start spraying the intake tube, vacuum hoses, base of the intake manifold, etc.. Otherwise, you would need a $1000 smoke machine to force air and smoke into the intake system.

 

[justaguy93]

Well still waiting for the WI weather to turn so I can check for leaks. In the meantime I have been able to isolate a pattern in that my car only throws the code if I drive it right after starting. If I let it idle for a few minutes before driving it never seems to throw the code.

So at least this is something I have some control over in the meantime.