I took my Volvo to the car wash today, but before that... i pumped some gas (the usual unleaded type), as I am driving out of the car wash i feel the car is going weak on me. I gave it gas, but it just started stalling. I pulled over -actually the car wasn't even moving- and after a few minutes it was fine. I drove a few miles and as i got to the top of a hill, it starts stalling again and loosing power and acceleration...this time it only lasted a minute, i was able to make it home with no further problems...has this ever happen to anyone? THANKS!!!