Thank you guys for all the advice.
Jay, to be clear, I don't think it's revving higher than it did before, but when I'm revving it all the way very loud, it sometimes will still only go at a very slow speed in the first, say, 10 seconds of acceleration.
Marky, yeah, I should get a manual. I might have someone look at it also because I might need to go on a long ride next weekend.
Thanks pat and roffman, I'll definitely have to look into all of those things.