Skyline engine power loss

Greetings. I previously encountered a similar problem with my Skyline. Symptoms were identical: check engine light, diminished engine output, compromised throttle response, and augmented fuel usage. Initial diagnostic tests pointed towards a malfunctioning manifold pressure sensor, potentially stemming from a substantial vacuum breach. Have you assessed the integrity of the vacuum lines connected to the intake manifold?

Thanks for the reply! When you say 'substantial vacuum breach', could you be a bit more specific? Were there any particular lines or areas I should be focusing on when I'm checking for leaks?

Certainly. In my circumstance, the vacuum breach was traced to a deteriorated hose connecting the intake manifold to the brake booster. Given the age of our vehicles, I would strongly advise a thorough examination of all vacuum hoses for signs of degradation or detachment. If visual inspection yields inconclusive results, a smoke test may be warranted to definitively locate any leaks. Considering the potential complexities involved, seeking counsel from a qualified automotive technician might be judicious.

Thanks for the detailed advice, I really appreciate it! I ended up taking it to my local mechanic. Turns out it was indeed a faulty manifold pressure sensor, likely caused by a vacuum leak as we suspected. The total repair cost came out to 235€. Runs like a dream now!