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Does the check engine light on your dash light up when you turn on the ignition, before trying to crank the engine? Does the fuel pump come on for a second, and prime the fuel lines, when you turn the ignition on? Does the fuel injector wires get the pulse signal from the ecu while cranking? If not, your jeep ecu might be in need of repair. It's a common problem with that generation of grand Cherokees.
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