I just bought a 1993 EXT EFI and sometimes when I try to accelerate from a stop the engine just revs up, but the sled doesn't move and I can smell the belt getting hot. It doesn't do this all the time, but enough. The clutch seems like it is engaging properly, but I'm not really sure. I was wondering if a new belt would fix the issue (the belt on it appears to be in good shape) or if anyone might have an idea what is happening. Thanks.