My 98 Acura SLX is still over heating. It has been in the shop for the past two weeks. When i start my car up and jus let it sit it is fine and does not overheat. But when I start driving it overheats and the cooling in the cooling tank bubbles and boils over. I've had the water pump, radiator, timing belt, and the thermostat replaced. I asked about the head gaskets but the mechanic said that they were fine. He also flushed all the fluids out. Does anyone know what else it could be? Someone told me to ask about the idle intake valve. Could that also need to be replaced?