Does this engine have an idle stablisation valve? Common problem on 1.8 Golf GTI engines. The ISV can get dirty and cause this hunting. ISVs can be cleaned but not too expensive to replace and quite an easy job.
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1976 Audi 80 L - Sleeping
1977 Audi 80 GLS - W.I.P
1991 Golf Mk2 VR6 Supercharged
2003 Audi A6 Allroad - Daily
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