Ran our second AutoX of the year this year. First one went quite well. Had two drivers running practically back to back runs in the first and third heats. Weather was windy, colder, mid 40's, a bit drizzly and overcast all day. This second AutoX was much warmer. Mid-70s and sunny with not much breeze. We also were running 4 drivers in the same car (2 drivers per heat). Towards the back half of the second heat our Fit went into a limp-mode halfway through a run capping the rpms at 3000. The back in the pits the car's idle was bogging between 250-750 rpm and after you let off the throttle it'd just die. First attempt was simply restarting the car in between a run with about a 5 min break. This worked for about another hour of runs. Then it happened again. This time we disconnected the battery for about 10 seconds, reconnected and it fired up without issue. The car did 2 more fast runs and entered the limp-mode on the third run again. After that, we called it a day. The car was throwing MAP pressure too high CEL's and a P0108 code.

I had an OBDII reader with live data on it and sure enough, the MAP pressure was around 20 inHg. After the battery disconnect it dropped down to 6-8 inHg and ran well. Unplugging the MAP resulted in 50+ inHg and it'd die anytime you touched the throttle. A couple things to note:
1. The weather was much warmer. Higher temps equal higher pressures.
2. We have a DCA header on without the exhaust heat shielding. This could have been radiating a lot of extra heat up behind the engine and intake plenum to where the MAP sensor is located.
3. The car had a light engine rebuild about 1000 miles ago (head gasket, timing kit, ignition coils, plugs and fuel injectors). Since then it's been throwing a P0172 - fuel system too rich - CEL that really hasn't affected driveability. We got the re-manufactured injectors from RockAuto, so my guess is they're dumping a little bit extra fuel in. However, in troubleshooting that I replaced the MAP sensor with a cheap one ($15) from RockAuto as well. I have the original one, but the cheap one was running on the car today.
4. I wasn't completely thinking with my head straight and didn't think to grab intake air temperatures while I had the live data up, but I bet they were high. However, the car did NOT throw any CEL's for high IAT.
5. The car sat for a couple hours in the afternoon and drove home without issue. Codes were cleared and it hasn't thrown any yet.

Any help/insight/input on this would be appreciated. I've got a track day weekend this coming weekend and while the car wont be making so many quick, hard, successive runs (the Fit ran nearly 20 runs with only a few minutes break in between each today), but it will have 20 min track sessions with an hour or so in between for Sat/Sun.