- Bad or non-functioning cold start injector
- Bad temperature sensor for ECU to operate cold start injector.
- Problem with ISV (idle stabilization valve) or its controller
- Air plate in fuel distributor is sticking
- differential fuel pressure regulator (don't remember the correct name) (on
front of fuel distributor) is bad or has dirty contacts
- vacuum leak - very likely
- water in the gas
- dirty fuel filter
- clogged air filter
- clogged cat converter
- blown head gasket - run a compression test
- more but this is a start
Sounds like you have some real diagnostic fun times ahead of you.
If it's got a carburator, you might check if there's an electrically
activated idle nozzle/valve. Most VAG carburator-engines used to have one -
have experienced this on several 1.8S engines of that age. The fix is
usually to re-connect the loose wire.
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