90 laser stock high rpm studder

[notsostockgalant]

Melting plugs is usually a sign of detonation, things i would check would be
Base timing
how clean the injectors are or if they are all functioning properly
check your fuel pressure as well as ,fuel filter, and fuel pump sock (21 year old car it could have some crap that came loose in the tank and plugged this partially)

Are your monitoring your A/F ratios at all? If not you could borrow someones logger or scan tool and check for knock and monitor o2 voltage (gives you a pretty rough idea of your A/F ratios) to see if it is going really lean or if your ignition timing is out of wack for some reason.