You 2007 Chevy Silverado 1500 4.3. If I let the engine idle (not moving) every 15 to 30 seconds there is pop noise coming from the engine. Any ideas? I only hear it when It’s parked and idling

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You 2007 Chevy Silverado 1500 4.3. If I let the engine idle (not moving) every 15 to 30 seconds there is pop noise coming from the engine. Any ideas? I only hear it when It’s parked and idling. Hot and cold temperatures do not affect it either.