2001 Chevy Silverado engine looses power and surges

Dirty fuel injectors (cleaning the injectors often fixes this).
Bad MAP (manifold absolute pressure) sensor
Bad TPS (throttle position) sensor
Bad or dirty MAF (mass airflow) sensor
Low fuel pressure (leaky fuel pressure regulator or weak fuel pump)
Vacuum leaks (intake manifold, vacuum hoses, throttle body, EGR valve)
Bad gasoline (fuel contaminated with water or too much alcohol)

Sometimes, what feels like a hesitation is actually ignition misfire rather than lean misfire. The causes of ignition misfire may include:

Dirty or worn spark plugs
Bad plug wires
Weak ignition coil
Wet plug wires

The loss of power and surging when cold and hot is something I'm dealing with too (haven't figured it out yet). As far as the ABS and E-brake problem you have. Is it just the lights on you dash that light up or is you ABS actually activating? I had a situation where, on dry pavement, when coming to a stop the ABS would activate. It was simply that rust between the wheel bearing and the ABS sensor was pushing the sensor "Out of range" from the toothed wheel. I cleaned the rust off of the wheel cylinder and bolted the sensor back into the hole. Problem solved.

I found the problem to my loss of power/surging. It was a bad MAF sensor. Now it runs great and the fuel mileage is impoved too. As far as your problem with the ABS/E-brake, not sure what it is.