well im justin i have a 91 camaroz28 that te ses recently has come on it has given me several differant codes 42)fault at electronic spark circuit fault at direct iginitiom system fault at fuel cut off relay circuit 43)low voltage at eletronic spark timinig circuit (poor eleterical conection open or short in in circuit44) oxygen sensor lean (poor electerical conection open or short in circuit defective esc module defective knocj sensor defective ecm things i have replaced oxygen sensor , knock sensor twice just to make sure i has a good 1 ,esc ,cap rotor spark plugs wires i have new ecm but says to check relay for a resistance value on solenoids and relays resistance values less than 20 ohms will ruin new ecm im so confused have tried so many things dont know what else to do car is my has always bin all oriignal an never touched so any body havve any ideas on what it could be or what to look for im in way over my head on money an my gir is ready to choke me help please