Corsa intake manifold issue

Sounds familiar. I've got a Corsa too, and those symptoms scream intake manifold problems. Have you checked for any hissing noises around the manifold area? Scorched spots are a dead giveaway. Those older Corsas were known for manifold leaks.

Hissing, you say? I haven't specifically listened for that, but I did see some gunk buildup and what looked like scorching near where the manifold meets the engine block. Is that definitely a sign of intake manifold failure on these?

The scorching and gunk are highly indicative of a leak, yes. And if you're experiencing rough running and error codes pointing to air intake issues, it all lines up. Whilst you can try and have a look, the best thing would probably be to take it to a workshop.

Appreciate the confirmation. That's the push I needed to bite the bullet and get it sorted. Dropped it at the shop this morning; they confirmed a leaking intake manifold due to scorching. 1180€ is what they quoted me, ouch... Thanks again for the help!