Accelerator Pedal problems of the 2003 Chevrolet Trailblazer

2003, Chevrolet Trailblazer. 4 speed automatic trans. 4 wheel drive. Standard length chasis. 6 cylinder engine. Problem experienced; upon acceleration onto the interstate highway, the engine lost power for appx. 5 seconds. The accelerator pedal remained depressed, the engine resumed acceleration after the time specified. Created much fear, since interstate traffic speed limit is 70 mph, and cars on the intersate came up onto the bumper very quickly. This is the only occurence to date. Also, gasoline filler neck too narrow, or vent hose constricted? frequent reflux of gasoline during the process of filling. Takes a considerable amount of time to "top the tank". So much time that, I have yet to been able to "top" the tank. Problem occurs at every pump, not indigenous to the gas pump, appears inherent to the vehicle.

When depressing accelerator pedal to move forward the vehicle hesitates and loses power regardless of surface level, inclined or declined.