Cannot figure out source of P0113 or P0135

I have a 1997 ford ranger 2.3l. Ive noticed it has started to idle rough and seems to have a very slight miss. I pulled the codes and I come up with the P0113 and P0135. So I go out and buy new upstream o2 sensor and new iat sensor. still no change. I checked the voltage across the pins of the iat connector and came up with 4.6 volts. I know it should be 5 volts but surely .4 volts isnt the problem. Im not sure how to check the o2 sensor connector, dont know reference ranges. could these 2 be causing a rich mix and be giving me my problems . oh yeah it does seem to want to bog or lag at wide open throttle.

any suggestions??? It is really using alot more fuel now also. this problem just came on all of a sudden. One day running fine, then the next day rounning rough. I also noticed this morning that it seems to want to stay idled up alot longer when coming to a stop.