I have searched and while I have found a few posts about blown capacitors and bad ECUs, nothing I have found is even close to the problem I am experiencing.

The truck runs o.k. when cold, firing on all 6 as it should. although, the spark on the #2 is weak at best when cold. It is a very thin blue spark when the wire is pulled off the dist. and checked for spark arcing. All 5 other cylinders have a great, healthy spark that shoots about 1.5" and is a nice, thick orangish yellow.

When the truck warms up, the spark on #2 goes away completely. It is non existent. All other cylinders fire away happily with the same strong spark.

I purchased this vehicle knowing the problem, and also knowing that it had been to several mechanics and none of them could figure it out. It has had the distributor replaced, the ECU replaced, cap, rotor, wires, plugs. everything. yet, nothing seems to help. I have swapped wires between #2 and #4 and the misfire stayed with #2.

The good news is, if you guys can't help me figure this out, Ive got a shiny new megasquirt ready to be installed and I am sure that will fix it.

Any ideas?