If my engine was sludged like my 1995 Toyota Tacoma was I would get some Gumout Multi thats in the seafoam style can and add when cold to crankcase and add remaining to gas tank and fill up after a 100 mi plus journey.Drive for a week, drain oil and filter and use a quality filter for replacement to catch gunk. Change oil and add Lubegard Biotech or Liquimoly Mos2. Run it 1500 mi and change it. Do the same process and change at 2000 mi. If it starts to look better continue and extend oci 500-1000 mi until it starts to show its ugly head. Adding the Gumout multi with PEA cleans your fuel system and protects from ethanol but it also gets into oil and helps keep things clean there too. Lubrizol had a video showing how PEA helps the entire engine. Say no to Seafoam, it does nothing and its MSDS sheet shows and proves it.
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