My '96 Civic has around 130K miles and has ALWAYS run great until recently when I noticed that it acts like it's gonna die when it idles. At first, I thought it was only when the A/C was on, but now it does this regardless. In gear it's fine, but only when I stop at a light, the engine falters (i.e. dies very very briefly) then comes right back to idle. This can happen as much as once every 10 - 15 seconds. It had a tuneup in Nov. 2006. Any ideas? Thanks!