I had the same prob. It is because you aren't getting enough spark under WOT. I didn't have a Ignition box. I bought one and it fixed it.
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Dustin
89 Saleen GT Sport
Supercharged 306
Started her up 6/8/03
Old Motor
Supercharged 347
516 rwhp
553 rwtq
11.249@126.83
1997 Honda CBR 1100XX Super Blackbird
162 hp
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