I am thinking of buying this car but when I road tested it it wouldn't rev beyond 2500 rpm. the guy said that it was because the fuel light had come on cuz it was low. Is that correct, that the car goes into limp mode when this happens. He took it away and said he's put more fuel in it and ran it for a few minutes and now he wants to show me it works fine now. Does any of this sound right to you?