What could cause and how would I repair fuel flooding on a cold start-up.

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During a cold startup the engine will flood and will need to let stand for a couple of hours to start up, during most startups one can't press on the gas pedal prior to cranking engine or it will cause engine to flood. Was told by one mechanic that restricting gas flow by pinching fuel line help once engine floods. The only sensor going off was the MAF and engine knock sensor, replaced the MAF.