My guess, either something wrong with an O2 sensor, or the MAP sensor. FWIW, here’s what some of those readings mean …
not sure what that wording about two fuel systems means
LOAD_PCT 17.6% — this means the engine is load is 17.6%, idling probably
ECT 84C – that’s the engine coolant temperature, around 185 degrees F, ok
the above are the fuel trims, in %. Not sure what the 1 and 3’s mean. The problem appears in the 3 circuit. Negative values means the computer is having to reduce the amount of fuel it is injecting compared to what it thinks would be necessary based on the MAP, IAT, and ECT readings. The O2 sensor is disagreeing, saying if it injects that much gas, it creates a bunch of raw gas coming out the tailpipe. the readings with an “S” in the front are short term fuel trims, and the “L” ones are long term. The long term reading of -38% is the one that needs fixing first. That’s the high priority here.
MAP 25.0kPA – that’s the intake manifold pressure reading. Atmosphere is 101 kPA at sea level, so that’s a vacuum of around 1/4 of atmosphere. Atmosphere is about 30 inches of mercury, so that’s a vacuum reading of 3/4 * 30 or maybe 18 inches of mercury as would normally be displaced on a typical mechanic’s gauge, about right at idle. May be slightly less vacuum that would be expected in a new engine. But still ok.
RPM 1904 – sort of high for an idle rpm
KPH 0 – vehicle speed probably, not moving b/c at idle
IGN 36.5 – not sure what that means
IAT 27C – intake air temp, the weatherman air temp at the time, ok
TP 12.2% – throttle position, meaning it is 12.2% open, about normal at idle