The wash you did with diesel and kerosene is the reason of the smell
to get rid of missfiring after the wash , get air gun and blow carefully around plugs and sensors in engine bay.
make sure no water has got into air cleaner.
Injectors : of bad , you will get misfiring and lack of power
cylinder head : mainly overheating , bubbles in radiator , engine or transmission atf oil in radiator
water into engine sump , clicking top noise ....etc
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