Replaced the plug wires? Have you had the timing checked as well? When you pulled out the fuel filter did you dump out the contents and note if any moisture was in the gas? Any your fluid levels dropping? Have you done a compression check? I would look at these items. They are reasonably inexpensive and can tell many tales about what is happening in the engine.

Answered by Bruce Hunt (expert)
3,803 answers provided

Coilpacks were changed with good units, compression test and leak down test were both done and nothing is out of spec. Timing is perfect. I didn't dump the contents of the old filter out, but did replace it so I don't see how that could be a problem. I have also checked for any loose connections and vacuum leaks.

Response from mdoyle
1 question asked

Reason I asked on the filter was for water in the system. Sometimes something so useful is so harmful. Water in the system can cause the symptoms. Wires, Wires, Wires. Simple stuff before the deep stuff.

Answered by Bruce Hunt (expert)
3,803 answers provided

The newer Honda's (the K series motor) do not have wires, they have coilpacks, which I have already changed, as stated in my previous posts.

I might try draining the tank then, it's nearly empty anyhow.

Response from mdoyle
1 question asked

Sorry I forgot about the newer engines and no wires. I have to keep kicking myself on that.

Answered by Bruce Hunt (expert)
3,803 answers provided

Thanks for the suggestions, i'll be draining the tank later today and putting in some high octane fuel to see if maybe there is something left in the lines.

Response from mdoyle
1 question asked

Well, after another day of swapping parts we finally narrowed it down to a bad Primary O2 sensor. Again, thanks for the help.

Response from mdoyle
1 question asked