why do i only have posi when i power break but if i striaght punch it i can only spin one tire????????????

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mods:85 Z28
k&n air filter
b&m 2400 stall speed
comp extreme energy 470 lift cam
headman headers with 80 flow master
stealth intake w/650 spreadbore carb
more to come

 

uhhh... you have 2 tire marks when power braking?... Do you have a Z?. I have a RS and if I gun it in reverse 1 side marks and forward the opisite one leaves marks.