1998 Acura Integra gas pedal a little bit Hard to press in

My gas pedal hard to press in, at low speed or when I start. When I am at low rpm and I press in the gas, I have a feeling of the gas pedal be locked. It look like a click I think .I have need to press more hard in the gas pedal the gas coming a lot, my head hit the seat. When I press in gas pedal on maximum and I shift the gear 6000 rpm like racing, no pedal gaz problem.

When the engine was cold the rpm bouncing up and down.