The plugs have been fouled by gas, I went one range hotter and they have lasted a little longer.
I added a bit to my first posting, but it only backfires right off the line if I put it under a good load. If I put my brake on and give it a little gas it will backfire or if I just try to excellerate hard. It also will backfire sometimes when starting. I am going to try to adjust the timing some tomorrow and will report my results.
Thanks again for your suggestions.
[This message has been edited by roangle (edited 05-09-2002).]