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If you search 'miss under load', your post comes up right below a 4.6 hesitation under load when HOT post.....read my reply there. Long story short, I have a 99 250 5.4.....had the miss under load thing for 2 years....#7 cop boot split, rest were fine....replaced it...runs like new. 15 bucks at Advance. Good luck and let me know if you get it fixed.