I am having a problem with with my motor, 99 z28. I am getting a engine code p0200 injector circuit open and a bad front o2 sensor error.
When im idling my rpm gauge does up and down motor is missing, and burning gas like crazy. Anyone no how i can fix this problem.

 

There are 2 fuses (INJ1 & INJ2), one for each bank of injectors which provide continuous voltage to the injector driver coils. The PCM fires the injectors by temporarily grounding the other side of the diver coil. Code P0200 indicates that one of the driver circuits is open. There are 8 circuits to chose from, but the PCM is not indicating which one is causing trouble. The problem could be in the wiring or the injector itself. Get a set of NOID lites and attach them to each injector, Run the engine and check that all lites are blinking. Adark lite or a steady lite indicate a problem with that cylinder.
1)A darklite indicates an open circuit, unplug connector from injector and test as indicated::
Check injector drive coil with an Ohm meter for continuity (11-14 Ohm)
Check forsteady 12 Volts from supply circuit (Pink wire)
Check for pulsing groundon lead coming from PCM (Various two color wires)
2) Steady ON lite indicates a steady ground on lead from PCM
Look for steady ground from lead coming from PCM

The O2 error is probably caused by the bad injector/s