Subaru Legacy - Misfiring sensation at M/way speed - Nsar

Hi,

My 2.5 Legacy has developed a feeling as if it's misfiring, like a split second loss of power, when I'm doing about 65mph+. It feels a bit like when you have very low pressure in one tyre, but all tyres are at correct pressure.

I've taken it to my local indy garage who are really good and they can find no fault.

I've noticed that one of my back pipes is sounding a bit throaty and wonder if a loss of pressure there might be to blame.

Any thoughts gratefully received, thanks.

Hello to any of the old crew still around.