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How would I know if it’s a bad o2 sensor? Is there a way to test them or do you just replace and how it’s fixed?

Just started flashing today when I changed the ect sensor

Yes on and flashing the only code is for evap system. And fuel cap light is on as well

Replaced ect no change

Would that cause the jerking when only reaching that rpm?

I have a 2003 Mazda. When the engine isn’t up to temp it runs fine but once it’s warmed up the problems start. Around 3k-3500 the truck falls on its face like the flip of a switch. And will randomly put power back in. This continues back and forth until you reach the rev limiter. I just can’t...