Make sure that the valve cover gaskets are not leaking oil into the sparkplug wells . this will cause a bad misfire and bad idle.i know this because i just fixed my mx3 v6 and this was the problem on mine. new valve cover gaskets and clean the plug wells out and clean the plug wires and problem solved!!!
You can get that diagram from the dealer just ask the guys in the parts dept for a print out,, to locate a loose or broken vacuum line, you can spray some carb cleaner in the areas that you think may have a bad line, the RPM's will jump up when the cleaner is sucked into the bad line
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