[1987ss]

I recently acquired a 04 grand caravan with 130k on it today i got off freeway and was sitting at light and i felt a pretty significant intermittent miss so i had it scanned and came back with those 2 codes and a previous evap code in wich i was aware of. Im gonna change plugs and wires in a.m. and possibly run sea foam threw brake booster vacuum. If there's something elese i should look at for those codes could someone please comment and tell me thanks!! I tried to clear codes and cel stayed on didn't go off and come back on it stayed illuminated??