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1. put your camera in shutter priority mode
2. set the shutter speed to roughly 1/(speed of car).. so for instance traveling at 55mph, ~1/55 sec shutter
3. have the chase car and subject car match speed as closely as possible.. set cruise control if you are having difficulty.
4. hold camera steady and snap away.. mulitple shots if possible.. you should be able to get many good shots out of it.
some tips: don't shoot midday.. sun will wash out all the pics.. don't shoot with sun in background.. an overcast day or dusk and dawn is best.. you can't do rolling shots at night