I just recently got my car tuned up. I have a 2001 galant v6. All of a sudden my car started missing and making this putting noise and when slowing down,idling or driving at about 35 car shakes terribly and feels like it's cutting off. The mechanic says I have a miss in cyclinder 3 he claims my valve is stuck from years of low grade gas. I was wondering can I just get a valve cleaner 2 fix this problem because spending $700 to replace it is not an option