i just bought a 99 rodeo with 3.2l v6 from a used dealer(we all know how that can be) and the check engine light just popped on while i was passing this guy uphill. there's no odd noise coming from the engine. all my fluids are good as far as i know being that i cant check the tranny but the manual said there's a light for that. i'm totally new to rodeos and have no idea what's wrong. any advice?