Hey guys, my girlfriend has a 2004 prius with around 220,000 miles. It was serviced regularly and was running perfectly until yesterday. I live in New England and it was incredibly cold overnight and her ancient 12V battery had died. I replaced it today using a brand new Interstate battery with considerable cold cranking amps. I started the car up and I wanted to check if the engine was running as it normally does and I pushed the gas peddle down and the engine was a bit weaker than normal. I figured it was because it had not run in a few days and maybe it was just cold. I let the engine warm up for a few minutes and pressed the gas again and it was still weak. The strangest thing was that when I floored the gas peddle the engine was louder and then became weaker when I held the peddle down. Any ideas?