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The injector may be leaking a little (assume it's throttle body injected) and flooding the engine. If it sits for a while, the extra fuel may just evaporate off, but while the extra fuel is there it would make it difficult to start the engine.

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17y ago
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Q: Is anyone having a problem starting a 1999 gmc sierra 48 lt after the engine is warm it will start after a few seconds but you can smell gas sometimes?
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