95z286speed

iTrader: (1)

hey guys, i just put in two new o2s a few days ago after the break in period on my headers. it starts up fine, but when it hits around 160 it will bog and lose power, bad throttle response, etc. But once it passes 160 it seems to be alright and maybe do it every once and and while? im thinking it might be a tune problem since i had it done on a dyno? when the tune was done i was running mid tubes and one of the o2s i found to be in pieces when i swapped to long tubes.

i checked rockers...they are fine....header bolts are all tight....any ideas?

thanks