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Sounds like it could be a vacuum leak that could have occured when you used the pressure washer on your engine. Check and or replace all rubber vacuum lines/intake tube that look suspicious or have cracks.
Also, you might want to check your plug wires and replace them if they haven't been replaced. When I first got my car and degreased the whole engine bay I got my plug wires wet and got a misfire. So I just picked up a new set.
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