non-thridgen(92 maxima)
 

i was doing a tune up on my buddy's 92 maxima, 3.0 V6, auto, and now it shakes at 1K and 2K, and at idle in drive. i did fuel filter, air filter, plugs, oil change with filter, and PCV., i thought it might be the gap on the plugs, but i changed the gap, and, while its better, its still a litlte rough. anyone got any ideas?

crossed wires, broke a wire, wire no seated on the post or plug

if its an se it has direct fire coils.
 

had one myself. Kind of hard to get the wires crossed. But,,, it is easy to get one of the coil attachment clips to not be fully connected. Check that.. back side is the worst.. a partially plugged injector (happens after sitting up all night) will also make for a rough (almost seems out of balance) idle. Usually worst during cold startup.