My 2004 Pontiac aztek runs great unless you have to go up a hill or pass someone on the highway. Three different mechanics including the dealership can't figure this out. When u accelerate more than granny style the acceleration cuts out. The car doesn't die or stall but just loses power. Coincidently with this problem came the abs light and wheel drive disable message. Help??

Loss of power at highway speed is usually clogged fuel filter or clogged air filter. Checking fuel pressure won't tell you if the filter is clogging up. You can still have pressure, just no volume. Air filters can do the same, except it will usually die or stumble coming to stops. The abs and disable light won't affect the engine performance. Hopefully you have a bad wheel sensor that is also disabling the AWD. The sensor is around $100 the actuator for the AWD is over $300