Mine idles from cold at about 2k rpm as it has a cold temp stat, the revs picking up could be down to the fan kicking it? It should idle once warm at just under 1k rpm ish, Sounds like yaristurbo has sorted it though lol
When you fitted the stat did you bleed out all the air? You can test a stat with boiling hot water and a bowl? Do the revs pick up and hold at a certain rpm or keep rising?
Random update on the 82 Stripped back end Removed carpets Rear floor plan painted matt black Ultra racing 3 point rear brace TD hybrid td04 set up (bloody superb) Matt black front bumper and spats Custom rebuilt front coilovers Heat wrapped screamer pipe