'89 Fox - Vacuum Routing

Just bought my daughter an '89 Fox. Don't have a manual for it but have determined from the forums which brand to buy. Did the tune-up on it and it seems to run pretty good. Found a split hose on what appears to be an accumulator on the driver side of the engine but it doesn't seem to have any vacuum to it. I'm pretty good mechanically but I've got some learning to do on this Fox. Near as I can tell, this is a CIS injection system (round, 4 hoses going to injection ports, 5th hose going to intake, etc...). There is some type of regulator (I suspect) on the fuel line, has a diaghram attached with a nipple for a vacuum hose but there is no hose attached. Should there be? and if so where does it route from? Only issues we seem to have with the car is that it is hard starting once it warms up and it idles a little rough but not bad (I've had a LOT worse). Any info anyone can pass along would be helpful.

Thanks
:thinkerg:

Yes it's CIS-E & that is the fuel pressure regulator. The vacuum hose goes to the throttle body right at the throttle valve (car's right side), there should be a tee that also runs to the distributor.