Hi,

I own a 05 Pacifica Touring AWD having about 27K miles.

I have two problems.

1. When I open the gas cap for refueling the car, I hear and feel some kind of air coming out from the gas tank. I've never seen this happening to any other vehecle in my life.

2. When idling, sometimes it shows unusual engine rev with some rumbling, not making a serious noise. It almost sounds like the engine is about to stall. It never really stalled though.

Chrysler dealer & bodyshop guys found no problem on my vehicle.
Please, give me some advices what to do with these.

 

The fuel systems in most cars these days are under pressure so you will hear air when you open the cap. I'm not familiar with your second condition.