Make SURE to include ALL information! Country, Year, make, model, specific engine, previous related and near- related problems (like any changes/work done in vicinity, etc).
A recent problem posted by a reader resulted in others here knowing the cause despite it having stumped three different mechanics. But the response would have been even more certain and direct, if he had disclosed EVERY 'odd occurence'. This is understandable, we all are subject to certain assumptions that might seem unrelated, thus ignore them.
And please give us feedback on the resolution of the problem.. as it is, we seem to have a very good rate of success but we dont know if you dont tell us whether we were right or wrong. ALSO that adds to the knowledge base here, some of us work out HOW that occurs then remember it for the next time it comes up.