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

 

imrc pooped possible

 

As said above IMRC sounds like a likely cause, at around £180 for the part and an arse to fit its not a cheap fix if the gears are all mashed up, sometimes part of the electrics to this unit fail and this can be fixed with a 99p parts and the cost of your own time. Check the manifold runners are being switched when the engine is started by looking at the lever on the end of the inlet, this should move, sometimes the clip snaps off the end and can be fixed cheaply but 50% of the time the IMRC unit itself goes faulty