Your ignition coil misfires, most likely ruined the converter
before they reached 12 to 14 years of age
You need all ignition issues resolved,coil issues resolved,
new converters,new O2 Sensors etc
You have no choice & can expect to pay over a $1000
Unless you have the vehicle scoped a couple times a year
& data looked at, your going to keep getting into what your
have now. You just drive until it breaks down, That is what
everyone does & it won't work on todays technology.
Your intake manifold has to come of just to do spark plugs
& coils on that motor,which is a MAZDA
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