what kind of new parts or upgrades have you done to the engine/ engine bay ( i.e. wires, plugs, fuel filter, distributor cap/ rotor?). i had that same problem and through trial and error i fixed it..... i changed the fuel filter, distributor cap/ rotor, wires plugs, and i had no luck. then i changed the old main fuel relay from the old rz-oo67 to the rz-0063 which is recomended by acura and all who have had this problem..... it helped but didn't solve the problem. then i took my car for a long drive to warm up the engine to max temp, turned the car off then on to see if it would stall, and it did, so i noticed my idle was oddly low (around 600 rpm. so i raised my base idle to 750-800 and it worked. the car ran smoother and started on the hottest days and even when my motor had warmed up completely. as for your car not starting even when cool in the morning. i think your main relay could be fried or something. i hope that helps.
