Originally Posted by SouthArk370Z

Freeze Frame 10:12 AM 9/6/2020
DTC P0300
Fuel Sys 1 CL = in Closed Loop mode
Fuel Sys 2 CL = in Closed Loop mode
Calc Load 34.50% = load on engine
ECT 115°F = Engine Coolant Temperature
STFT B1 0.00% = Short-Term Fuel Trim for Bank 1 (right side)
LTFT B1 0.00% = Long-Term Fuel Trim for Bank 1 (right side)
STFT B2 1.60% = Bank 2 (left side)
LTFT B2 3.10%
MAP 11 inHg = Manifold Absolute Pressure
Eng RPM 1038
Veh Speed 1 mph
Spark Adv 9.0°
IAT 93°F = Intake Air Temperature
TPS 4.30% = Throttle Position Sensor
02S B1 S2 0.28 V = ?
STFT B1 S2 99.20% = ?
02S B2 S2 0.28 V = ?
STFT B2 S2 99.20% = ?
Run Time 48 sec = how long since you started the engine
MIL Dis 0 miles = how far you've traveled with Malfunction Indicator Light (AKA Check Engine Light) on.
LAMBDA B1 S1 1 = ?
02S B1 S1 2.21 V = ?
LAMBDA B2 S1 0.99 = ?
02S B2 S1 2.19 V = ?
Command EVAP 0.00% = something to do with emissions
Fuel Level 63.50% = how much gas you have
Warm-up DTC CIr 2 = ?
CIr Dist 9 miles = ?
EVAP_VP 0.0 InH2O = more emissions stuff
BARO 30 inHg = atmospheric (AKA BAROmetric) pressure
CAT Te 11 111°F = ? CATalytic converter temp
CAT Te 21 111°F = ?
ECU Volts 14.24 V = supply voltage to ECM
LOAD Value 29.00% = ?
EQ Ratio 0.99 = ?
Rel TPS 0.00% = ?
TPS B 4.30% = ?
ACC Pedal D 0.00% = position of accelerator pedal in cabin ("D" signal)
ACC Pedal E 0.00% = position of accelerator pedal in cabin ("E" signal)
Command TAC 3.90% = ?
MIL Time 0 hrs, 0 min hours, minutes = how long MIL has been on
CIr Time 0 hrs, 52 min hours, minutes = ?
FUEL_TYP GAS
MAFA 0.81 (lb/min) hours, minutes = flow through right side MAF
MAFB 0.84 (lb/min) hours, minutes = flow through left side MAF

items with no desc should be obvious

Edit: Grab a copy of the FSM. Link in my sig. It will explain the parts I didn't know.