i need help w/ my silverado plz

[likuitn]

My 99 5.3L z71 silverado (ls) stalls (losses power) when going up the hill, and wont accelerate right going down the hill, but on plain terrain, it runs like a charm... what could it be?????????????? plz help.

[2000CAYukon]

For the engine to loose power, air, fuel or ignition (spark) is being lost or disrupted when you are going up/down hills.

This sounds electrical (loose connection) to me. It could be a fuel pump (in the gas tank) connection and you loose fuel pressure when in the hills.

I would check battery cables and look for anything loose under the hood. I would put a fuel pressure gauge on it and watch the pressure when the problem happens.

//2000CAYukon