1999 Chevy Silverado Idles fine but when you give gas the motor shakes and bucks

[Robertbassin5]

Ok guys and gals I really hope you can help me. I have a 1999 Chevy Silverado 4.3l extended cab. Here is my problem when I start my truck it seems to idle fine but has I press on the gas pedal the motor shakes and bucks but while doing this I unplug the tps an it gets smooth  So if you'll have any ideas let me know. Thanks

[riverbanks]

You found it?bad tps?dead spot in it

[John Newkirk]

Mine did the same thing. It turned out till be the distributor cap. The traces for plug 1 and 2 run right next to each other and sometimes burn through.