My 300SEL has been very reliable, but I started to leave today and its acting funny. It started fine (its 21° here - well below average for us!) and it started missing and the dash lights were getting dim and bright, dim and bright (my taillight out warning light was on). I shut it down. I am thinking it sounds like my battery may have a poor connection.... I had a bad connection awhile back and it would start to stall. I may not have it tight enough... does this sound like it may be the case? I just came back in and decided not to go - and my Lexus dont like to go on slippery roads. Too cold to deal with it today... any suggestions?