Codes 42,33

I decided to scan my computer today and its giving me a code 42 and 33 can anyone let me know what these are and how I may fix it?

90 Firebird V6 3.1 (Stock)

33: map signal voltage high:check vacuum hoses from map
sensor.check circuit connections at the pcm,or replace 42 ignition control circuit:check wiring between ignition module and pcm,or replace ignition module if nessesary