where do I start?

94 z28 check engine light. Stored codes, 22,32,63,64,71. Had transmission redone two years ago, car still wouldn't shift right. Took it to Chevy dealer they disconnected A/C evap sensor, car ran great for two years. Now getting check engine light On and Off. Any ideas?

i think you need a new o2 sensor. wouldn't hurt to clean the maf sensor, if it even has one, i'm not sure if your vehicle is equipped with one or not.