my car (90xr7 3.8 sc) has developed a prob. At about 4000 rpm if im flooring it it acts as if it has a rev limiter cause it'll bounce around that rpm for a bit then go up to 5000 and shift. it has a really rough ride for 2 or 3 seconds until it passes by. i've been told my car has a miss to it so i bought some sparkplugs(ford double platinums)
but i have not changed them yet. could other factors be causing this prob. that i should change as well, ie. wires and coil?