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what motor? is the coil producing spark?? If so, check the fuel pressure, if the fuel pressure is low drop the tank, repace the pump and also replace the filter (located on the frame forward of the tank). If the coil is not producing spark, check for shorts or opens in the circuits as well as the IGN fuses. If there is NO fuel pressure at all check the fuel pump fuses and make sure the fuel pump is plugged in and there are no opens in the circuit
Could be a dirty fuel filter and the fuel pump starts to over heat causing the fuel pressure to drop, also a bad ICM (ignition control module) will cause this and eventually when it fails. the engine will not run.
Start with replacing the fuel filter and if that does not help, replace the ICM.
When this happens, have someone listen under the car and see if the fuel pump is coming on. Either the pump or relay may be going bad. An easy check for the relay is to see if there are any non-essential relays with the same # on them (like a fan relay) when your'e having the problem, temporarily switch the two relays. If this helps, then replace the relay. Before condemming the pump, replace the fuel filter (often neglected), and do pressure tests at fuel rail to see what you are dealing with. Note: it does not have to be fuel... A bad coil or crank sensor can do essentially the same stuff so, don't jump to conclusions before making tests! good luck