stumble on accelaration

[fmh]

hi guys.
I have a 93 mx3 v6 with 226000 miles. had it for about five months. it been a great car, but know it started to give me problems.
when its cold it rans fine but when it warms up it misses.
it only misses when i take off or when i stomp on the gas pedal, its more like a stumble /other than that it rans great it got plenty power
i have been dealing with this problem for the past two week but I cannot figure it out

I have replaced
wires 7mm and plugs (ngk)
put a new cat
change iac valve
put a new cap and rotor
but steel doing the same thing
any info would be very helpfull I really like this car And would love to have it running good again

[Mad Cow]

What colour were the plugs when you pulled them out? Do you get the check engine light?

[fmh]

was getting a code #06
the plugs were a little black and have some white color at the tip
it just started doing that a couple of wek after i did the tune up

I found out hat the wires were arching so replace them but I still have the same problem
fix the arching after the fifth set
they were sparkin araund the manifold