What would make a 1993 marquis all of a sudden not want to take the gas when going down highway but if you let it sit awhile it will start back until it finally cuts off?

There are many things that can cause this to happen. You may have to check all of them to solve your problem. A dirty fuel filter is the most common and the cheapest to repair. You may have a fuel pump going out. You can have dirt stuck in your jet in the carb. You can have vapor lock going on. These are all to do with gas. You may also have jumped time or lost a timing chain or belt.