clean the intake manifolds and see if that helps, also run some injector cleaner to see if that helps, if neither of those helps then we will move on to the next thing to try. with 70k i bet your manifolds are all clogged up with stuff. that should help alot if they are really clogged, if you need a how to there is on the main page

98.5 Black SE ATX S&B filter, SVT MAF, optimized SVT TB, mesh grille, removed orange reflectors, painted rear reflector, gutted pre-cats, optimized SVT LIM, 19lb injectors, resonator removed cant afford an svt but lookin for 1 in nc