My 97 mod mercury 75 hp 3 cylinder will not stay at full speed. I tried pumping the hose, replacing one coil at the time, clean the carbs. but still it stays at full speed for 10 sec and goes a little down, 2-300 rpm's for 10-15 sec and back and forth.<br />it starts nice and easy. Sometimes it is a little slow accelerating, but it takes 5 sec and then the power is there. <br />i did not check the compression on the cylinders<br />the oil pump is disconected<br /><br />artic surf