I'm stuck in high gear,help!!!

I am seeking advice, help, information.insite, how about a match!!! :banghead:
My Chevy 94 4x4 is stuck in high gear, I have little power. Takes awhile to get to high way speed. replaced TPS, fuel pump, new map, still at a loss. At first it started with hesitation and now this . Not gettign any readings. Hope someone can help. Thanks.

If you mean an AUTO tranny and it is not dropping back to first when you come to a stop , you need to park it before you destroy it . It it quickly overheat and burnout the bands in the clutches .
Can't help with a fix though . Rob