i have a rs pro gen 1 that i am having a problem with. it will run for about 3 mins then slow down like the battery dies. the pack will still be reading 4.0 per cell or more but the power is gone. wil a bad capacitor cause this? i have reset the esc and checked all the sittings and they are all fine.

I would try a different battery. Borrow one if need be. Would be my first suspect is the pack is getting soft on punch.

ive tried multiple packs.

No, a bad cap won't cause this. What motor is are you using? In what car? with that battery?

Check your sensor lead.

Have you rebinded the radio to the car?