The new one's ticking around

Hi,
This is a 4.2 machine from 1992.
Sometimes, especially in the morning, he doesn't take any gas down there. Feels like dry driving. Then you give a little more gas goes the mail off. With speedy driving, you hardly notice. Most of all, it bothers me when you're after someone and the accelerator just strokes. Then you turn it off and drive again later everything is OK except for a slightly wave-like acceleration. Has anyone ever had problems with the throttle valve Poti??

Greetings Stefan