~3400rpm is the point that your secondaries should open. If you are losing power, then they are probably stuck clsed or not opening as much as they should.

I dug around in the archives and the possible causes are : bad imrc or a fuel pump on the way out.

HTH ....

Bless our servicemen & women overseas. L.Cpl Ian Malone, 1st Battalion Irish Guards, R.I.P.