If you're having fuel issues I wouldn't go WOT at all. It's a recipe to explode and melt things. Lean under load = bad day.
Misfiring and high afr at idle is commonly a vacuum leak. You should log the following on your AP:
Short term a/f correction, Long term a/f correction, AFR #1, MAF, Load, RPM.
Post these values at cold start, cruise, and warm idle.