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I have a similar problem, mine conecting tube was splited in half, but when i connect both ends, engine start to missfiring shutting down cyl1, cyl4, etc...
When i leave tube splited, it has engine light but all cylinders working, i delete engine faults and chk engine wont come back until next cold start.
Car seems to have all power but little rough idling.
Also on splited connecting tube only rhd side have vacuum, on lhd side there is no pressure. I changed vented duct on lhd but no change...
On carly i am getting throttle angle-manifold vacuum-corellation and charge air cooling-energy operation.
All problems started after season in garage without start and low battery warnings.
Please help someone
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