My kia sedonna loses power going up hills

SOURCE: car loses power when going

The first thing you need to check is fuel pressure. If you don't have a fuel pressure gauge you can buy one from a tool supplier, but the gauge may costs more than the diagnosis from a shop.
Another thing you may want to check is you catalytic convertor to make sure that it is not plugged.

SOURCE: losing power up one particular long hill

It sounds like a tranny problem. Without more info kinda hard to diagnose. The simplist thing to check is tranny fluid. If its low, going up a hill will pull fluid out of the torque converter. It could be the converter itself. It could possibly a fuel problem, but unlikely. Hope this helps. John...

SOURCE: decellerates while going up hill

faulty maf sensor,bank 1 lean (get new maf sensor and use 89 oct or above fule

SOURCE: 1986 Honda Civic 4x4 loses power up hill.

try downshifting

SOURCE: i have a 2002 ford taurus that loses power when

Replace fuel filter, spark plugs and definately plug wires. You should also make sure intake filter is clean and clear.