have been running map3, hks plugs and had no issues until..........sitting at stop light and noticed 'putt-putt" coming from exhaust. limped home after dropping to map0 and CEL lit up. read code and showed misfire cylinder 3. called an engine guy and he asked had i change fuel grade and i always run 93 octane. filled my tank the previous day and he asked if the station's tanks were being filled that day and just so happened they were.....water settles in the main tanks and he said i may have gotten some in my tank. since map3 is funny about the octane level, i swapped the plugs and added a bottle of "heet" and ran the tank dry before re-filling. now running map2 with no issues.......moral of the story, be wary of the higher maps if you can't verify the quality of fuel in the tank.....