Checked connections under covers and wires all good replaced icm and cpr 2 new batteries new oil new filters won't pull it's own weight running on 4 cyl... please help oh and I tried putting it in 4 low to get home and it won't go it goes into 4 high but won't come back into 4x4 low??? Seperate Problem or same and I have a check engine light I just bought it it's been setting for 5 years...

 

you need to check your hpop pressure on right bank,sounds like bad injector
could be injector oring
steve