i had a really bad hesitation problem at 3500 rpm, and it stumped me for about a week.....until i looked at a secondary ingector and found that the electical connector had come loose from it

things like these make you feel just a little stupid

 

Glad you cought the simple fix. If it happens again and the wires are fine, see the archives for the 3500 or 3800 RPM hesitation issue. It's a common problem solved by a little modification to the ECU.

Rex