A couple of months ago my civic started to develop a rough idle right after startup. It goes away after maybe 5-10 seconds and doesnt happen everytime. The car also has trouble starting from time to time. I wasnt too concerned but my fuel economy seems to have dropped slightly, more so around town. I have recently replaced the fuel filter and the air filter is clean. The car is an automatic with about 140K miles. Any thoughts? Thanks

 

Plugs & wires? When was the last tune up?