2000 Honda Prelude OIL LIGHT GOES ON AND ALMOST STALL AT ST

Hello there when I drive the car in the city under 40 to 50 miles is ok at stop no problem. when I drive in the freeway for 35 to 40 minutes 70 to 80 mph, when I go out of the freeway at the first stop the light of the oil goes on and the car almost stall after drive it back to 40 miles ok no problem, the car has new time belt wather pump gaskets spark pluss the car goes on ok no problem, some body told me because is runing in the freeway at high rpms and when it goes back to 0 the car almost goes off, or is the throuter sensor, this problem is almost make me crazy we put an other distributor, and the same problem, everything start with the change of the timing belt. before no problem what of ever we clean the troutle body to see if the can fix it nothing. if you drive the car in the freeway fo 15 minutes no problem only when is over 35 or an hour. and no computer errors crazzy.....