Do they test the 2500rpm first, then idle?
If so, you might need a new O2 sensor. Even though not registering as bad, an older sensor won't allow the system to normalize when dropping to low idle from high as quick as it should.
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Mike Tangas
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72
'02 CLK320 Cabriolet - wifey's mid-life crisis
2012 VW Jetta Sportwagon TDI...at least its a diesel
Non illegitemae carborundum.
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