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I bought this motor used so i dont know how long it sat before i bought it but when i looked at it it started up and ran good. it took me about a month to get it on my boat just cuz i work so much. It starts and runs fine at ideal but as soon as u get it to bout 2800-3000 rpms it wants to bogg down and die. All the filters and fuel lines have been replaced. Also has new water pump and thermostat. Any ideas to try next.