GMC Repair: service engine light, vacuum leak, vacuum line

Question
Ihave a 1998 olds sihloete that just had the fuel injectors replaced along w/ a tune up less than a year ago. My service light recently came on and when diagnosed it said that there was a missfire on cylinder #3.the van runs fine but the light is really buggin me.I just want some reassureance. can you help?  

Answer
Could be a faulty or dirty injector. Could be a vacuum leak near the # 3 cylinder caused by a vacuum hose leak. Could be a faulty intermittent spark plug or wire.

What mechanical work or ANY kind of work has been performed on the vehicle recently ?. As most problems that occur after a recent repair was made can be traced back to the area of where the repair was made as a vacuum line may have been knocked loose or a wire connection came loose, Look around in the area where work was performed..


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