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still have no idea whats wrong with this thing... any ideas?

So I took the car to a mechanic, the car was sent to 2 different mechanics to find the problem. They ended up changing the crank shaft sensor. I go pick it up today, take it for a drive, it drives a lot better no more bogging out, but I still have an engine light (code 04) and it still struggles to ...

Yea I have a cold air intake

I had just purchased a 1994 mx-3 GS, its been giving me a few problems...

Idle jumps
Engine hesitates until i reach 2000 rpms or if i floor it.
driving at a constant speed for a while, engine light comes on and engine loses power.
takes about 10 seconds to start up

I did the diagnostic test and i ...