Idle issue

So I ran through search and didn't find what I was looking for. When I start my 86 (2.5L, ax-5, 4wd, ugly) after it has been sitting for a few hours, it starts and runs okay until it heats up. If I stop somewhere and restart it after only a few minutes, it tachs at almost 3,000 rpms, and won't settle down for almost a minute. It hesitates off the line once it is warm, and is misses every so often. The fuel filter, cap, rotor, plugs, wires are all fresh, the old pieces looked average coming out and I am confused as to why this is happening. Anyone have any suggestions?