Leftysdad

Recently acquired a 92 wd21 that's automatic with the 3.0.....been parked a year....don't know any history(owner passed), it will crank and run, but poorly....codes are 12 / 21 / 34 / 51 Idles very low, with a skip/miss when accelerating, only thing I've done is unhooked the 2 prone coolant temp sensor, and it will idle higher, but still runs poor....any direction of where to start would be appreciated, thanks in advance