As my game tag is RevampedSine732, I am not sure you asked me. I assume you asked me, as there are only 2 posts so far: mine then yours.
I had the engine stall since SU 5, but now from SU 6, it seems the engine no longer stalls.
Yes it must have been a typo or incorrect value that caused the engine stalling.
I have NOY yet had the engine slowing down to ~ 1500 RPM max. Try to delete all Extra planes , then redownload them. Maybe something got corrupted in your system.
Yes these bugs are frustrating, especially the 2 new ones, as the brakes pedals and zeroing of the G-meter were working perfectly just before SU 6.
It is obvious they did not test the Extra properly, as it took me 10 seconds to spot these 2 new bugs.
If they had, they would have seen this!