I just converted my 87 (88 vin) 1.6 sami with a 1.3 8v head to propane. The kit is fabuous, but for some reason my RPMS are increasing when the engine is warm. I idle about 1000 to 1500 rpms to keep engine stable. It goes up to 2000 or so when it gets warm. I have advanced the timing for the increased octane, I have also adjusted the valves and checked for manifold leaks. Does not appear to be any. I forgot however where the vacuum hose from the distributor goes and am not sure if the advance vacuum system is working. I set my timing according to manifold vaccum at 1000 rpms.  Any tips would be great.
Thanks,
Thor