Q: Misfire
so i have been having issues with my car, first the battery died, easy fix. then the valve cover gasket and all the plugs where changed. then i had the exhaust completely redone. now it is intermittently misfiring on all cylinders. some days it'll drive fine, some days it will misfire on all cylinders. some days it'll be driving then start to randomly misfire. I've checked the plugs, I've changed the fuel pump and the filter. all the spark plugs are new. I'm wondering if it is my ear valve? I've also sometimes get a catalyst efficiency low code. so maybe the ear isn't giving enough back pressure to my intake?
My car has 70110 miles.
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