1997 chev 1500 pick-up I need some help with this
On 10-30-2011 I replaced the fuel pressure regulator, which greatly improved truck performance and gas millage. Flooding was causing engine mis-fire I am still getting trouble code # 172 &175. I am also getting two new codes #420 & 430. Can ya'll tell me what I need to check or replace to get rid of the two original trouble codes, and or if I did something wrong to cause the two new trouble codes? My auto mechanic skills have fallin off over the past few years and the complexity of the newer autos has greatly advanced.