Stalling at the lights is possibly the idle control valve sticking
get a new one or try cleaning the old one but I don't like you chances
other otion is get rid of it all together and blank it off (no cold start this way)

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RS RA
The more people I meet the more I like my Dog!

12.463 1/4 mile, not bad for an old school Liberty [DECEASED]

MY08 Liberty Tuned by STi