had one for many years....by chance do you have a check valve in your engine exhaust system which stops back flow of exhaust water ? if so check if you can hear valve clicking open &closed...if not a noise then supporting pin in valve is worn out & when engine started valve sit up &partially blocks exhaust outflow..get some black soot out exhaust & little power...have come across this a number of times in past years.....there is large opening on check valve with some straining can be opened.....feel around & see if check valve is fastened and freely opening &closing.....takes a really sharp atomic 4 mechanic to catch & repair before taking whole system apart &replacing most of discharge system.....this is not that hard to do...some check valves undo in reverse to normal opening direction....replacement valves run about 75 to 100 dollars in real plumbing outlets not local hardware chains...be sure to get correct metal as well as seeing pin for valve same metal if not plumber can easily replace pin for you...
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