Engine misfire troublshooting

[Kudzupatch]

The Saga Continues!

On a whim or moment of inspiration I decided to plug the EGR vacuum line and drive it a couple of days. Stumble is 90% gone. So this leads me to think I have the 'wrong' replacement EGR. Haven't hooked up the computer to see what is going on yet but the difference is obvious.

There is still something else going on and I am very suspicious of the ignition system. There is still that issue of where the high knock counts are coming from. So I still have some work to do but if feels good to finally see some progress.