pulled codes - no clue what they mean

[90rangersuper]

aright, comming home from work the truck started running rough when i come to a stop, it would hesitate taking off, not to horrible though, going 65 she runs great. I got home and the cel came on so i pulled the codes, the koeo passed, the continuous gave me 54 - act indicates -40f/circuit open,63 tp below minimum voltace, 66 - maf below minimum voltage and 41 - no hego switch detected then i did the engine running test gave me codes 74 - brake on off circuit failure, 42 hego indicated running rich, and 77 operator error(dynamic response/ cylender balance test) i got these out of the haynes manual i have replave the tps,iac,plugs and wires and put a new o2 on her. I am looking for a little direction on to what i should look at. The truck is a 90 ranger 4x4 with a 4.0 a4ld
Thanks

 

[shadetree]

MAF sensor bad/dirty. This thing will cause all kinds of weird problems.

Wiring connections. Random codes indicate an unusual problem.

Intake manifold gaskets leaking. Is it losing coolant, bubbles in the coolant with engine running, rough running when first started cold? shady

 

[90rangersuper]

i did clean the maf but it never hurts to do it again, i am thinking some of the codes are previous ones that are not cleared yet, say if you unplug the tps while its running wouldnt that store a code. i know i unpluged the mag and tps while the truck was running to try and pinpoint things a bit. i will check for bubbles in the coolent when i get home from work today. Comming to work today she ran great, it ran great from startup to work about 20 miles away, yeasterday when this problem came up it was about a week since i seen the issue