Braking & Acceleration issues w. '87 Sierra
 

Hi, every time I press the gas it feels like the brakes are already activated.
When I press the brakes it feels like I have to work extra hard to get them to work -- like I have to push the pedal all the way to the floor.

Separately, every so often I will lose acceleration, and I will get a funny smell, almost like overheating but I don't see any radiator fluid overflow.