Car starts shaking at 60 mph, and sometimes at the light it goes bellow 800 rpms and shakes as hell, changed the fuel pump, throtle body, sparks and coils, alternator is giving up 14.5 V, everything seems fine beside the god them car! Any ideas?
Shaking at 60 mph is most probably due to unbalanced tires or a fault with drive trains. Have the tires balanced and check wheels for damage.
Bad axle shafts, especially the inner joints, would cause vibrations at high speed.
Low idling speed coupled with bad angine mounts would result in bad vibrations. Have the throttle body and IAC cleaned and retest.