Hi, I have a problem with my mercury OPTIMAX 200 engine, year 2006. Engine has lost rpm, it usually runs between 5300 and 5400 Rpm at wot. Last few times I went out with it Engine maximum rpm is around 4200rpm, I have replaced spark plugs, fuel filters but problem remains. It also seems to get worse when I leave it on low revs for a while and then try to open throttle maximum rpm goes down even more to around 3400 rpm. Today I got my mechanic, he connected the computer and found no faults, he replaced some high tension leads and coils but still problem persist. 1 thing he noticed is when he hooked up gauges to check fuel and air pressure, pressures are ok both for air and fuel with ignition on but as soon as I turn ignition off fuel pressure drops down strait away to zero air pressure remains good. Any suggestions? Engine sound perfect on idle. Last thing I noticed is that engine is using nearly double litres per hour at 3500 rpm then usual. Thanks in advance for any suggestions
