Hi,
**Kenmore Series 80 Dryer**
Model#?
"80 Series" isn't it.
http://www.applianceaid.com/model.html
Some model# helps.
**but even when I tried to start it while empty, it would struggle to start and just stop**
We normally start to eliminate things like a seized/seizing drum support ( wheels, glides ) that might be holding the motor back from running. Might even slip off the drum belt and see how easily the drum turns on it's own. If nothing is holding the motor back from running, then the motor itself may be going sour.
jeff.