Engine light and fan, no limp mode?

[Skinnykinny2]

Hey guys, had my car remapped but the figures were around 170 (from a 155 THP, the figures were actually 123 before the map...). After this, got the walnut blasting to help get some more ponies and did the job.
The next day, engine light came on, fans came on but no limp mode so assumed it was a sensor not plugged in but couldn’t see anything. Now 3 days later I found that the PCV piping under the intake manifold was not secured and actually hanging loose. Pushed back on but now when I start the car, it almost stalls, then revs a bit, then fluctuates coming back down; does the fluctuations when revving at idle too. Took for a quick test drive and drives normally but fans and engine light still on.
Any ideas as to what to do to fix? My friend plugged it in BEFORE I found the loose piping and a fault reading “intake air flow fault coherence’ is the only thing that came up.
Thanks guys!

[Skinnykinny2]

*edit*
just driven the car to work, 10 min trip, I think the revs go back to idle as soon as the throttle input is removed, same when changing gear so now the revs shoot straight down making gear changes jolty.
Is this where the car has got used to running without the PCV so now it’s back in it thinks something is wrong? It didn’t do this when the pcv was not attached...
is it something to take back to the mapper for him to look at or can my mate clear it off the system and hopefully run correctly?

[Chris_Blue]

Ooosh. A few issues here, and a few years since i had a THP

Is there any existing fault codes?

Where did you go for remap and walnut blast? Did they know what they were doing?

You can blank the PCV Off, or maybe fit a catch can- but doubt that is giving you the problems

I reckon its the map.... without looking at it