Took it to a pal of mine who restores old Chevys.. He cleaned the MAP sensor and went over my hoses , some of which were disconnected... Like Magic she purred like a kitten... The only thing is the check engine light is still on.... I checked bank 2 and still got 321 and 221 .... It runs like a drea...

Hello And Good Day All, I have a 1990 740gl with the regina system in it.. The Car starts, a little hard at times, and upon firing it idles really rough.. After warming up the idle wanders from about 500-1500 continuously.. It drives okay at speed, but often stalls at lights.. I get codes 321 221 12...