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My car was the same way when I had my mail order tune. Would run like s*** below 3500rpm....The tuner had to correct my short term fuel trims...they were all over the place.

What plugs and gap are you running? That could explain the hesiatation in higher rpms. Should be running some afz22's plugs gapped at .040.

Do you have a logger? Something you can go for a drive and take a look....thats something I regretted when going FI, should of got something with a logger so see what the hell its doing after....

Now I've said that my engine blew on the dyno when tuning, but the tuner said that my s***ty mail order tune that I ran for 1 year could have taken its toll on my engine, which makes sense. So get yours looked at quick.