I went 12.4's with your mods.. + catback, and ls6 intake and no tune.

something is up

 

what should i do to figure out this loss of power? any suggestions

 

I suspect your car needs some basic maintenance and if it doesn't run better afterwards, get that "basic" tune checked.

 

you think it can be the tune??

 

2 cans of seafoam and some deepcreep never hurts. i seafoamed my car in my old h.s. parking lot the other day and a cop pulled in with his lights on thinking i was doing doughnuts and burnouts. when i explained to him what i was doing he just said, "oh, okay. it sounds like you know what youre talking about so i believe you. just go in the back and do it." Feels like its more responsive now since doing that.

 

i seafoamed it before not as of late im prolly gonna seamfoam the oil, and for the fuel i bought a cleaner called superchargell its by bg its supposed to be some good stuff bought at a speedshop