hi i had a power problem with my 170 last week were it would not rev past 4000 rpm and if you tried it felt like it was going to stall! i have already paid out for two diagnostic tests which has resulted in a new pump and filter but this hasnt helped so it is now having another diagnostics test but they dont no where to start looking now the pump has been changed so i could see this been a very expensive try and see fix so any info would be appreciated thanks