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You may have lost (went bad) a coil pack which feeds ignition fire to two of the four cylinders. Leaving it to run only on 2 will sound terrible, run rough, and have little power.
TO REPLACE SPARK PLUGS YOU REMOVE COIL PACK MOUNTING BOLTS THEN REMOVE THE COIL PACK WITH BOOT OVER THE SPARK PLUG.YOU HAVE 6 INDIVIDUAL COIL PACK TO EACH CYLINDER. YOU NEED A 3/8 RATCHET WRENCH - LONG 3/8 EXTENSION -SPARK PLUG SOCKET - SPARK PLUG GAUGE.AND TORQUE WRENCH.THE 2000 MODEL JEEPS FUEL FILTER INSIDE THE TANK.1993 - 1996 MODEL JEEPS FUEL FILTER LOCATED LEFT SIDE OF THE VECHICLE NEAR THE FUEL TANK.
All MX-5's are MIATA'S. the coil pack may be bad. 3000 rpms at 20mph, sounds like the trans is slipping if it was an automatic trans. it helps when you tell EVERYTHING about the car, like what trans is has, ect.
have you replaced coil pack? Check EGR passage through upper mainfold and make sure clean. also make sure EGR valve not stuck part way open. Also check crank and cam sensors along with MAF.
have you tried changing the coil pack? they are simply a coil of wires inside. they easily go bad. just to be sure switch one of the coil packs to make sure its not a problem with the wiring, if the problem switches cylinders replace the coil pack
The cat converter was trying to burn all of the excess fuel that was being sent out of the exhaust due to the misfire, got way to hot and melted the inside of the cat. I experimented with this while in tech school. You can burn up a cat in about 15 minutes at around 3000 rpm with a single cylinder misfire. I also work at a shop that specializes in miatas, and have seen this before. Get a new catalytic converter.
Change the plugs and plug wires first. If still a problem, troubleshoot the coil packs that the plug wires fit into, located at the back of the engine.
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