Interstar Diesel Jerking Accelerating

Sounds rough! I've got a Nissan Interstar as well, though mine's a bit newer. Had similar symptoms a while back – loss of power, rough running, and that check engine light staring me down. Turned out to be a leak in the intake somewhere. Basically, unmetered air was getting in after the airflow sensor. This will cause the engine to misfire as the air/fuel mixture will be wrong, which is why your engine is jerking and stalling.

Cheers for the reply! Where exactly was the leak on yours? Was it obvious once you had a look, or did you have to do some serious digging? And did you replace the whole intake manifold, or just a gasket? The symptoms are similar, so I want to start in the right place.

Honestly, I'm not mechanically minded enough to say exactly where the leak was. A vacuum leak can be tricky to find. I took it straight to the workshop and they sorted it. From what they said, the manifold itself was cracked, and the gaskets were shot. They replaced the whole thing. Best bet is to get it checked out professionally before you start throwing parts at it.

Appreciate the advice! Took it to a garage. Turns out you were spot on – intake manifold was leaking like a sieve due to scorching. New manifold and gaskets later, and she's running sweet as a nut again. Cost me 1180€ all in, but worth it to have her back on the road. Thanks again for pointing me in the right direction!