[scottfab]

Forget all effort into the secondary vacuum for now. Cycling every 15 min is not perfect but not going to be a big issue yet. When it stays on, then worry about it. Once you've found your miss then you can come back.

Yes do get a scanner. Don' t waste time with any "short two pins" and "watch the led flash" and "count the flashes".

Spend time on the 45 psi fuel issue. It may not be the source of miss but is low and will cause hard starts (long start time) and shows the pumps are tired. I would not settle for less than 50 psi. How many seconds does the engine crank before starting?

Check the codes and go from there. However, checking the MAP hose is easy and has been known to cause issues like you are describing.