tap on the iac valve also, and spray some cleaner/wd 40 up into the iac valve...the little flapper gets stuck sometimes and this causes the surging and idling problems when stopped at a light. seafoam cleans all that carbon out, after you let it sit a while, take it around the block and watch how much crap seafoam is cleaning out...do it on the road , well ventilated area.....
i put a 1/3 can in the oil cap, 1/3 of the can sucked up throughthe vaccum lines and 1/3 depending on how much gas you have left...make sure to change your oil if you decide to pour seafoam in your crankcase.....
also when sucking it up through vaccum lines,do it slowly, just to the point til it sounds like the motors is bogging, stop and continue....
good luck
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