Misfiring under load
 

93 Del Sol 1.6l 250K miles. The engine idles fine but appears to misfire when accelerating above 1500 rpm. It all started when the spark plug wires went bad, I replaced them and all was good for two days, then the ignition coil died. I replaced it and all was good again for two days when it started misfiring again. I've replaced the plugs, dist cap/rotor and fuel filter. I've checked the ICM and it ohms out to specs. HELP!