engine is bogging/sputtering at 3500rpm
Have you pulled codes yet? mine was doing the same thing and come to find out after pulling the codes it was my sensor for the cam, I could get it up to between 3200 - 3500 then it would bog, backfire, even died a couple of times. If you baby it from a stop will it go okay till 3K ? or how bout full on from a stop will it just bog and stutter big time? anyway's mine was the sensor took care of all my problems with a new one

Yes mine would be okay while in park, as I understand it, if you are not putting a load on the motor ie....in gear, you can rev the whole range without any problems. You can get an OBDII reader for about $120.00 from Kragens, Autozone, Napa, and others. It sounds like it might be your sensor but of course I'm just comparing what you stated with my personal exp.
Good Luck
Johnnie
Tony
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