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Q: Engine turns over, but will not start. on 1993 Mercury Cougar

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When trying to start the engine it will turns over just fine, but it won't start. I have changed the rotor & distributor cap with not change. Maybe is not getting fuel?
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If the engine cranks over the battery and starter must be OK. The engine needs three things to start, fuel (gasoline), ignition (spark) and mechanical integrity (it must develop compression in each cylinder to start ie mechanical components must be in synchronization with each other. If it had run well previous to this no start condition chances are the engine is well mechanically. Had the Check Engine light been on? The engine may have lost spark or fuel which could be due to any one of a number of sensors having failed or the fuel pump or related components are not delivering fuel to the fuel injectors. The engine uses many sensors to report engine temperature, air flow into the engine, crankshaft and crank shaft position sensors to allow the computer in your car to make calculations controlling fuel and spark to the cylinders. It is hard to speculate without being able to hear the engine crank over and do some preliminary tests to determine the cause of your no start condition.
Start off with the cheep fixes, I would start replacing censors and some fuses. Or at least check the fuses and replace the coolent censor.the guy above me is absolutely correct. I had the same problem once with a different car though. The coolent censor was no good. As a result on a warm start the car would not start because the computer did not know the temp of the engine and was not giving the right amount of gas. However if I let it sit and I started the car with my foot on the gas it would start. Maybe try it.
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