Hello i got a check engine light on on my 97

You need to have PCM / ECM - engine computer checked for DTC'S - diagnostic trouble codes an go from there ! there are hundreds of codes these newer vehicles can set ! I hope these people who changed the sensors an catalytic converter checked codes first ! You never ever just replace parts !!!!!!!! A DTC will lead in a diagnostic direction ! Check Engine Code Scanner Advance Auto Parts

Time for the dealer to take a look. You need special skill and special tools to diagnose this not to mention years of experience with electronic engine control systems.

I don't think it is your catalytic converter because your light usually flashes and a bad cat I never heard of them causing a misfire. I ran your other code it is for a faulty EGR system. Exhaust gas recirculation excessive. You are getting too much exhaust gas back in the system. This will cause your misfire. Go-to a trusted mechanic and have them check out your EGR system.

you need to check the fault codes, check engine light can have hundres of possible causes.

yes there is ..an O2 sensor is near the catalytic. have the codes read at an auto parts store for free! This will determine what is wrong.

I would think you already have a game plan

Stop driving it, and diagnose the problem

Doesn't sound like something simple or cheap,
do you think!

Yes and No. The EGR can cause the car to idle rough and or stall. I am assumeing the check engine light was on and set code for EGR and Catalytic Converter. If the engine isn't running right it is possible the cat won't work right due to improper air fuel ratio that the EGR is causing. To do repair proper the EGR should be fixed then clear codes and see if the code for Catalytic Converter. There are other reasons that would your car to idle rough or stall I am just assuming that this mechanic got codes or tested the EGR right.

CATALYTIC converter!!!!!

You need to check the mechanical timing which means bring the engine to TDC firing stroke and being very sure that the notch on the front lower engine pulley lines up to the number zero after that look to make sure the cam sprocket or sprockets and there corresponding timing mark line up to the reference points if one is off a tooth you must reset. I suspect on is off that is why you must do this check. after this check the timing with a timing light to ensure it is timed via turning distributor to its correct setting I suspect 10 - 12 degrees BTC.

Had this issue did you replace the exhaust