1995 Oldsmobile 98 Car stutters when going up hills and I c

Hello, I am driving a 1995 Oldsmobile 98. The problem I am having is that when the car is warm and I take it up a hill I the engine starts to lose power and starts violently stuttering. If I floor it, the shuddering will stop, and if I let off the gas the shuddering will stop. I replaced all three ignition coils, the fuel filter, and I cleaned the throttle body as well as the Mass airflow sensor. I checked the vaccuum lines to the fuel pressure regulator, and I have made no progress. I have also found that after I drive somewhere, when I get out of the car I can smell gas. But there is no gas leak, so I am wondering if I am running too rich and getting misfires going uphill or if the fuel pump is freaking out. I am at a total loss because no warning lights or check engine lights are coming on. Thanks