ONLYFD4ME

So i've only been driving my FD now for just over a month since I got it back in the fall and had it stored. The car was running mint and I had no problems with it and then acouple days ago with no signs of any problems in the making 1st, 2nd and 3rd gears feel at about 80-90% of the power rate of what they did but the biggest thing I noticed was that in 4th and 5th gear if you try to accelerate quickly theres a hesitiation and loss of power usually between 4000-5000rpm. Now as a newer owner I haven't had much of a chance to look into many of the technical problems but I was hoping some of the veteran owners might have had the same problems at some point and any feedback would be greatly appreciated as there is not much for rotary help here in Nova Scotia. Thanks a lot.