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Sounds like you have a faulty alternator, sir. Your car seems to be running off battery power. Once the battery power is exhausted, the engine dies. It will start and run again if you charge the battery, but only for a few minutes until the battery dies again.
There is a black fuel relay way up under the top left driver side dash that breaks its main wire solder connections on the circuit board under over-heat conditions. Resolder that relay. Starting fluid will show that you have lost fuel delivery under no start conditions. You can use the breather hose from the valve cover for this test.
You are on the right track by finding the injector pulse missing. The computer grounds the injectors based on signals from the cam and crank sensors. You may have to use a scanner to check for trouble codes in the computer and watch the sensors work. The problem could also be a relay or the key switch.
The battery might be low but I doubt it is causing the "no idle" problem. You should have an idle air control valve that the computer uses to adjust idle speed. That valve could be faulty or dirty. Is the check engine light on when the engine is running ?
check your ignition coil for cracks. i had the same problem. when the coil heats up it expands thus causig a break in the windings. it cost me $300 to find this out.
i would check your ignition system. you would need a meter for this but look for broke or loose connections. if it was a fuel problem i dont think it would just start up after 20 minutes. or you might try your ignition switch. if its shorting or something then ya well it would cut your engine off real quick
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