Need Help!!!

I was driving my truck when I stomped on the pedal to accelerate and had nothing, then a few seconds later I had power and it was normal. If I step on the accelerator and accelerate slowly everything is fine. A month ago I removed and cleaned the EGR Cooler/valve and CCV. I Checked under the hood and I have some black soot over the Trans dipstick and the side of the cooler by the Air filter tube. No trouble codes and nothing else appears wrong.

I watched the RPM gauge at 1,000 I stomped on the pedal and nothing unit about 2,000 RPM's it took off. It sounds like the exhaust brake is on but its not.

Hope I can get some help so I can get it fixed before I go back to work.....

Thank you for any input.