Allion manifold pressure sensor issue

I have encountered a similar issue on my Allion. Were there any notable incidents preceding these symptoms? Recent maintenance, extreme weather, or unusual noises from the engine bay? These factors can greatly assist in pinpointing the problem.

Hmm, not really. Regular maintenance as usual. No weird noises I can think of. You said similar issue - you mean you had all the same symptoms? What did it end up being?

Yes, the symptoms align precisely with my experience. After a thorough diagnostic examination, it was determined that a substantial vacuum leakage was the root cause, leading to a malfunctioning manifold pressure sensor. It is advisable to seek counsel from a proficient automotive technician for a conclusive diagnosis and rectification. Attempting to resolve such intricate matters without the requisite expertise may inadvertently exacerbate the situation.

Okay, thanks for the heads up! I'll take it to the shop then. Turns out you were spot on. The manifold pressure sensor was faulty due to a vacuum leak. Cost me about 235€ to get it sorted, sensor replacement and all. Runs like new now!