Post by
Supererogator »
https://forums.nicoclub.com/supererogator-u125809.html
Mon Jun 08, 2009 6:43 pm
It is my understanding that Japanese vehicles of this age, are very reliant on the vacuum system. Best to leave it in. I also know that many people have disconnected some of the emissions control stuff, and this has been done to mine, but I fixed some of it up when I replaced the hoses, and this has made it a bit more consistent.
You might also look into the timing, plugs, plug wires, and firing order. These can all be issues as well.