Here are some notes of codes that seem relevant Compared to a stock 2001 Z28

CAI or IAT modification, was stock IAT in Maf and removed?
P0111 Intake Air Temperature Circuit Range/Performance Problem

DBW or DBC ?
p0121 Throttle/Pedal Position Sensor/Switch A Circuit Range/Performance Problem
p0122 Throttle/Pedal Position Sensor/Switch A Circuit Low Input
p0123 Throttle/Pedal Position Sensor/Switch A Circuit High Input

Engine Temp in Logs?
p0125 Insufficient Coolant Temperature for Closed Loop Fuel Control
p0128 Coolant Thermostat (Coolant Temp Below Thermostat Regulating Temperature)
p0131 O2 Sensor Circuit Low Voltage (Bank 1 Sensor 1)
p0132 O2 Sensor Circuit High Voltage (Bank 1 Sensor 1)
p0133 O2 Sensor Circuit Slow Response (Bank 1 Sensor 1)
p0134 O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1)
p0135 O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)
p0137 O2 Sensor Circuit Low Voltage (Bank 1 Sensor 2)
p0138 O2 Sensor Circuit High Voltage (Bank 1 Sensor 2)
p0140 O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 2)
p0141 O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)
p0151 O2 Sensor Circuit Low Voltage (Bank 2 Sensor 1)
p0152 O2 Sensor Circuit High Voltage (Bank 2 Sensor 1)
p0153 O2 Sensor Circuit Slow Response (Bank 2 Sensor 1)
p0154 O2 Sensor Circuit No Activity Detected (Bank 2 Sensor 1)
p0155 O2 Sensor Heater Circuit Malfunction (Bank 2 Sensor 1)
p0157 O2 Sensor Circuit Low Voltage (Bank 2 Sensor 2)
p0158 O2 Sensor Circuit High Voltage (Bank 2 Sensor 2)
p0160 O2 Sensor Circuit No Activity Detected (Bank 2 Sensor 2)
p0161 O2 Sensor Heater Circuit Malfunction (Bank 2 Sensor 2)
p0171 System Too Lean (Bank 1)
p0172 System Too Rich (Bank 1)
p0174 System Too Lean (Bank 2)
p0175 System Too Rich (Bank 2)

? Disabled by mistake? IDK
p0200 Injector Circuit Malfunction

p1133 HO2S Insufficient Switching Sensor 1
p1134 HO2S Transition Time Ratio Sensor 1
p1153 Bank 2 Fuel Control Shifted Lean
p1154 Bank 2 Fuel Control Shifted Rich