The reason Jhal asked about a leak down test is that this would be the normal way to distinguish between lack of compression due to valves or rings...
Unless your mechanic did this already and you simply did not mention it... I would certainly have another mechanic look at it...
Of course , if idle is the only thing it is affecting... you might consider driving it a while ( a long while probably ) before it actually gets bad enough to warrant fixing... who knows , you might run into a deal on another car... LOL...
For the record, my 240 was tested and had more difference than that on one cylinder.. that is why I got it for a song... but I get 28 miles per gallon out on the road... have a problem tearing into the engine with it doing that... LOL
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