Does anyone have any info on this?

There is also an extra solenoid on the vacuum rack and a plastic chamber mounted near the leading coils which are not mentioned in the fsm.

These both have something to do with the fpr vacuum system but i'm not sure exactly what.

After searching i did find a relevant post but it wasn't much help:

https://www.rx7club.com/showthread.p...ghlight=s5+fpr

Here's a pic of the vac rack and plastic chamber