Honda Cylinder Misfire

Hi,
I have a 1998 Honda Crv, about two weeks ago it started running really rough and idling really low and occasionally stalling. So I changed the spark plugs, wires, distributor cap, and rotor. It seemed to be running a little better but the idle was still low and it still stalled occasionally. So I did some research and based on what other people on the net were saying decided that I probably needed a valve adjustment. So a week later I took it to the shop I use and asked them to check it out. They called me back and said yes I did need the valve adjustment, but also that the timing belt needed to be change (because the last shop I used never actually changed my timing belt when I had it changed 20000 miles ago). Anyway so I told them to go ahead with the work, I picked it up the next day and everything seemed fine. Then the very next morning the check engine light came out (it had not come on at all up to this point) so I took it back to the shop. They reset the check engine light and told me the error code was a misfire in cylinder 1, and I should check the spark wires cause on was probably loose. So I left and went home and messed with the wires, again everything seemed fine then the light came on again. I these time I figured rather than go back again I'll just have a look at the wires, distributor cap and plugs myself again. But again the check engine light keeps coming on after the car has been running for a few minutes. Which brings me to the present the shop insists that it is my spark wires and that the valve adjustment and timing belt change have nothing to do with the cylinder misfire codes I keep getting, but I ran the car for a week and half with the new wire etc. With no problems and no misfire codes. I think it has something to the valve adjustment / timing belt change, so I'm taking it back to them on Monday to leave it there again for them to find the problem. Anyone have any advice or input on my problem? Thanks in advance.