Engine 2007 SHELBY GT500 --DEAD MISS

i have 2 -- 2007 SHELBY GT 500's..I have a miss or stumble at normal driving.Under full throttle,no problem. I've changed plugs-coils-air filter-fuel filter,no change.I was told to test voltage on TPS. Ok.BUT;;;where can i find a spec.on what it is suppose to read ;for my veh.?Everything i find says,pepends on model;it varies..If mine is bad,why do i want to install a new one and set it o the wrong voltage?!!!Yes i need help.THANKS.All this elec.stuff is over my head.
 
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