Hello and welcome to FF
You should be seeing closer to 90% or higher but 78% will set the WOT fuel , your TPS is where the ECU gets is % reading from
If you had spent the almost 90.00 twords a SCT xcal3 you could of had a tune , scan tool etc but at 4 times the price
A tune wont change the TPS settings , either you have a bad TPS or try adjusting your a bit they wont move much but they will slightly
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