Raptor Chapter

Any help on this would be much appreciated. My V Raptor has always run slightly erratically for as long as I've owned it anyway.I've just noticed the MAF sensor (under the seat in front of the relays) is connected to the wiring harness but has no vaccuum pipe coming from it at all.I'm sure that can't be right, I guess it should go to the inlet manifold somewhere but I'd really appreciate it if someone could confirm if it should or shouldn't have a vacuum tube connecting to it.
Thanks

This is the air pressure sensor so no pipe needed.

Erratic running? plenty of possibles there & a good search of this site should help (from google try "site:raptorchapter.org.uk <search text>")