I was driving the truck on Sunday for about a hour when all of a sudden the truck started to to shake while driving and it seemed I lost power coming out of the engine. I could shift into the gears but as I gave it gas the engine would rev up and move forward but the truck wouldn’t gain speed. It was as if the engine wouldn’t go past 2000 rpms. It almost felt like my brakes where locked up because as I drove home the truck was shaking and it seems like I was losing compression. I had to drive up a hill that I normally don’t have a problem getting up, but I almost had to put it into second to get over the hill.

I checked the tires and all spun so it wasn’t my brakes locking up.

I don’t even know where to begin with this issue. In the end...it felt like I was driving against something or like my brakes had been locked up which they weren’t.

Any help or thoughts would be appreciated on what might be happening.
1964 Chevy k10 with a 283 engine and four speed. Thanks John

1964 K10 Fleetside Pickup Truck