Hey guys, my 2000 accord 2.3 vtec has about 225k on it. No timing belt issues, no fuel pump issues, new cat, new plugs (ngk), wires, cap & rotor.
I have noticed here lately that my car sounds like it is running on 3 of 4 cylinders. Previously, it would sound that way, but only for a little while, and when cold, it sounded fine. Now, and recently I noticed that the issues has become worse; the car sounds like I have a bad plug, wire, or injector... but don't (i hope). I have swapped plugs to see if the DTC reads any different (P0301,2,3,4) if I had a bad plug; the old wires did the same as the new (may have replaced needlessly).... Okay, I need to get to the point because I feel like I am rambling.
My question is: are there any components (crank/cam position, Coil Feed, Ignitor unit... etc) that may affect a misfire? I wonder and feel like the issue may be electronic (or a possible failure of an electronic component). I ask simply because I have (while the engine is running) pulled the #1 plug wire, and injector plug (not at the same time) and neither seem to affect the idle of the engine; however, when I do the same to the other cylinders, the engine just about wants to die. That is the reason for my suspicion. Any ideas?

Thank you, in advance!

Clem

 

Run a compression check in all cylinders.

 

Have you checked the EGR passages?