I can't remember who posted it now, but I too have been a victim of the
jumping cars bug in screamer. It only seems to happen just as you are
approaching the start finish line. It is possible to beat it, as I have
completed the game!!! Once you beat PRO, you get to race 1 on 1, against
the bullet car, it's not too hard to beat. This means you get access to
race all the tracks, backwards as well as forwards, and you can also race
the bullet car.
I suggest you use the TIGER (manual) for all the courses except Palm Town
Night, where it seems to be best to use the HAMMER (manual).
The best way to beat it, is to learn which gear you can take each corner
in, change down just before the corner, and you should be able to drive
the whole course without taking your virtual foot off the gas!!!!
Good Luck!!