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01 ls v8 if i unplug sensor to check if bad will car die?
The engine will start and run with the MAF disconnected, just not super well. However, disconnecting the MAF while the engine is running could very well kill it, and is not a good diagnostic method.
What are you trying to diagnose?
Fuel rich and fuel lean codes
Knowing what the codes are would help. They could be for upstream or downstream o2 sensors, bad EGR valve, IAC, and a couple other things.