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Car started bogging last couple of days. I removed gas cap to add gas line antifreeze and there was a large woosh of air IN and the car started to idle really rough. Bad gas cap??
 

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The emissions system in your car has problems... There is what is called a "purge valve" that sounds like is stuck... It is there to allow outside air into the gas tank as the monitored pressure/vacuum levels change when the gas is drawn from it...

Think of sucking air/pop out out of a pop bottle...The more you suck out the higher the vacuum that pulls BACK and stops you from drinking... That is the same with the engine drawing gas without a means to replace the gas in the tank with air...

That's why you have idling problems and have a woosh from the air going back into the tank... You should have stored OBDII codes even if you don't have a CEL (check engine light) pointing towards your problems...

Just some thoughts...
Dave
 
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