i still have this intermittent misfire problem on my '94 mazda 626, i was told it could be ignition. i've changed my high-tension wires (finally), and my plugs are fairly new, but the problem won't go away. also had the fuel pump circuit rewired (because it failed catastrophically in the middle of EDSA! dead car!)

basically, at idle, there is no misfire (this is what makes the problem hard to diagnose.. can't replicate it consistently) although very occasionally, the engine will burp. however when above 2000rpm or so, it will misfire relatively consistently (but not all the time..)

i'm now thinking maybe the fuel pump is weak (my old pet theory) although the repair guy at shell maya said the fuel pump doesn't change output depending on load, it just runs at a constant pressure. other idea, weak coil pack (expensive to fix, one-piece distributor and coil pack).

ideas? thanks...