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I am new to this so forgive me if this is not as it should.

I would like to know if anyone can help me, My audi 100 2.6 v6 (year 1993) and engine code ABC has in the last few weeks started to waver the revs from 1000 to 1500 during warm up. it will start and run fine for a minute or so then start to rev as described, i noticed it first while letting it warm up in the frosty weather but it is now doing it more reguraly. I thought it was only while letting it warm up when sitting still but in the last few days i have got in and drove straght away BUT after about 3 miles if i clutch for traffic it will do it then also but after 10 minutes on the road it will idle fine.

Power does not seem to be effected nor has the starting but it is embarrasing and annoying, SOMETHING IS wrong but i do not know what.
I was advised to blow out the crank vent pipes but this did not work.

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