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Check fuel pump and fuel filter.

My 2000 Express 1500 with 5.7 had same symptom at 110K miles. Fuel Pump was weak. Be careful putting fuel or starting fluid in throttlebody, it can flame back out at you and may damage the honeycomb MAF and it's expensive.

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Q: 1999 Chevy Express 3500 does not start when cold no fuel getting to the plugs but if you put fuel down the throttle body it starts and will continue to run when the engine warm?
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