Hesitation at WOT
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first things first, take the edge out and see if it helps or not. do you have a cai? was it ever tuned up? and with what brand plugs? and was dielectric grease used? 05 5.4 engines had a bad batch of fuel injectors, they warrantied them up to 100000 miles, i'd have them checked. has the fuel filter ever been changed? and how long ago?