1999 Honda Accord Shuts down

My 99 Honda Accord is completely shuts down while driving on the Hwy. Then after 2/4 sec. It starts again and everything is fine for a week or two. Sometimes when it shuts down the radio air etc also shuts down and sometimes they don't. I have had the cap and spark wires recently replaced but that hasn't solved the problem. A friend suggested that because I run the car with very low gas level that trash in the gas may be causing the problem.