I am having an issue which I am sure is easy for someone here to know the fix. I have done a valve cover install and the P0400 code still shows even though I have switched them already and tested them. The O2s however also have a lot of foul smoke coming out of them, and the rpms stays way off. Could also be oil residue which is causing the smoke.
https://youtube.com/shorts/A69YTcAVkO4?feature=share
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