I have 95 honda accord ex did tune up pcv valve rotor cap dist cap plug wires and i put e3 plugs ran royal purple fuel treatment and half way through tank started to idle rough and running rich. After about 20 min of running but if i shut off let it sit 5 min it will start running fine then after a few minutes it will start running rough again

 

Are you getting any codes/CEL on?

Did these issues start beofre or after the work was done to the car?

 

only code i know is for the clock spring.started after the work.other than the rough idle runs perfect.

 

Re-check the codes, just to be sure a new one has not come up.

 

still a code 11 only

 

What light is giving this code - CEL, D4 or ABS?

 

I have heard a couple of mechanics (Ericthecarguy being one of them) say to use the plugs recommended by Honda (NGK or Denso) and OEM wires. I use NGKs. At $2 each or less, they're cheap enough to just replace at the recommended interval, although I have regapped them and run them beyond 30k miles without issue.

Is it running rich or misfiring? Are the wires seated all the way on the plugs?

 

Here is my .02 I just went through this with my 95 accord for inspection. I had to many hydro carbons to pass and had a rough idle. My recomendation and how i fixed the issue with my accord was A. NGK sparkplugs and B. I did not see anywhere where you changed your air filter or if you have a reusable filter clean it. I went from My idle being ruff and hydro carbons running 280ppm to smooth idle and hydro carbons going to 145ppm. This fixed my issue good luck.