Engine hesitation at part throttle

I have a 97 Z-28 that has a stumble or hesitation at a part throttle or just off idle. I also noticed when I was coming to work today that at about 30 MPH it would stumble several times. Has anyone had this problem and it has been the throttle position sensor ? Thanks Steve

Good luck.
I had mine into the dealer so many times they called my the car (the hesitator) and never did find the issue.

I had that. Changed the TPS and MAF, cleaned out the fuel rail and it was POOF! gone.