Mazda Miata Heat and AC Problems
                    Just got my new 2008 Miata and am loving it.  However, I get very warm - almost hot air from the dash & other vent ducts even when the temp. dial is set to max. cold.  Get VERY hot air when temp is set to warmest setting.  Will get cool/cold air when A/C is turned on.  Wonder if a heater gate valve is not closing fully.  Anyone else have this problem or have insights?                
                        
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Thank you.
Marshall17
What year? Transmission?
I had a coil go bad on a Forester and it started misfiring, so it could definitely be the coil. 184k miles is a long life for an ignition coil.
It could also be the wires. The ignition wires on my 93 only lasted about 30k miles. I changed them TWICE in 87k miles, so if yours are older I would start there since it's cheaper than a new coil.