I have a 1990 K5 Blazer with original motor. Transmisson and transfer case are all new. Lately when I accelerate on take off it sometimes stalls or almost dies and there is no power/ very sluggish. Going up the slightest incline is starting to be a struggle for my Blazer. I have replaced the Fuel pump, fuel filter, TPS, rebuilt the TBI and pretty much all sensors are new. Any of you have a clue what might be going no. There are no code lights either, idles and starts up like normal.

Respectfully Straka