My BL Savage

Well, I just got out for a test run. I must say I'm not too impressed, but then again, these batteries ARE stick packs, and they weren't recently charged. It's really glitchy, the steering is responding fine, but when I peg the throttle for a few seconds, the motor seems to be getting power, then losing it, then getting it back again. I think I'm overgeared a bit too, the motor was cold to the touch, but the ESC was 97 degrees after around 5 minutes, and I never even went close to full throttle. Anyone have an idea why my truck is spuddering? (And no, it's not cog :P ) Could any interference be caused by the motor being so close to the receiver?