2009 Toyota Scion TC. Just installed a new battery yesterday. It had the usual horn sounding after, found that just had to leave the key in on position when connecting the battery. Ran the car yesterday several times and for about 30 minutes this morning. Went out to warm it up again now and it started for about 10 seconds, very rough idle, sounded almost like there were no exhaust pipes connected and loud coming from the engine area under the hood and real rough idle and brief puff of vapor, pressing on the gas pedal did nothing, It is about 5 above here right now. lt then died and will now just turn over. Does not even try to kick, just turning over. Hoping someone has some or any suggestion. I am 65 years young and been working on vehicles all my life, buy a DIYer. Any help is greatly appreciated. Joe in freezing Illinois.