did you bleed the air out of the cooling system? via the bleeder a top the t stat? if not the temp sensor may not be getting any coolant to it. or maybe a bad temp sensor.
also does the a/c work? if the compressor dont turn the fans wont come on like they should. as far as a/c is concerned.
the misfire could be a bad icm, under the coils. some times you can take the coils off and clean it up (the icm) and it will work. you can also test them.
and the rough idle, check for vac leaks, the T's like to break, under the sc snout, and the one on the fpr.
the fat vac tube that curls back off the TB to the evap also likes to hide a crack as well.
if you find your self needing a new vac line on the vac tree on top of the sc, cut the line first with a razor then remove, or your sure to break that tree. its plastic, and been through a how many heat cycles? yeah, its brittle.
the old fashioned carb cleaner sprayed around the vac lines and sensors will make the idle jump some if theres a leak. you can pin point it like that.
