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      My '99 Chevy K1500 5.7 L Vortec has problem starting when it sits overnight in very damp, foggy type weather. It tries to start after cranking for longer than usual but will only partially turn over & mostly just sputter & chug a little. I suspected ignition problem like moisture under distributor cap Or coil but found that if I spray starting fluid or dump gas in throttle body it starts but dies as soon as it burns what was added. As long as I keep slowly pouring fuel in the TB it will keep running. The moisture is a definite factor because the only way I can get it to stay running is to dry it out with a small electric heater or heat gun. It only does this when the weather is just the right sort of condition, damp & foggy where when you lift the hood everything on the motor is damp with condensation. Once it is dried out it runs perfectly smooth with no missing. I can drive 100 miles down the interstate in the pouring rain & it will perform perfect with great acceleration/ throttle response Etc. Once I get it dried out & it starts on its' own, I can turn it off & on & it starts right up just like normal, no problem.
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      My 99 Yukon with Vortec 5.7L suddenly won't run. It cranks over fine, starts in about 1 second (normal), but then dies 2-3 seconds later. Giving it a little bit of throttle while starting doesn't make any difference.
       
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