so i got a 5.3 00 silverado that im having problems with . the truck runs and shift good its only when i punch it feels like it bogs down then it feels like it lets go and keeps on going . it does not feel like it wants to turn off it just feel like it loses power thanks

 

I don't really understand what you mean bud, I understand when you get on it that it bogs down, but what do you mean feels like it lets go and keeps on going and doesn't want to turn off?

 

like when i get on it lets say to pass a car it boggs down like it needs gas then it feel like it starts to gain speed again

 

Clogged Cat or a gummed up throtle body?

 

You didn't say what year or how many miles,but I would suspect your fuel pump is getting ready to give up the ghost.

If you have a 100k or more miles very likely....when you punch it the fuel pressure drops,then when you let off it regains some.

That's why is drives fine just putting around.

Mine did the same thing for a long time,now when I punch it it just keeps pulling

 

it cant be the tb cuz i just add it an aftermarket one nither the cats cuz it cat less i just replaced the engine like last week o miles . i think it might be the fuel pump cuz it did it with my old engine and with the new one too

 

Fuel pump is gettin ready to take a **** on you. Sorry, it's a very very common problem with 99-02 silverados. My truck, my bro's, and 4 of my buddies have had to replace em

 

Your fuel pump cant supply the volume at WOT. You are right on target for the age and miles for the pump. Read a post yesterday about changing the pump by tilting the bed and blocking it up. I guess I would have unstrapped in and lowered it like I did in my 99 Tahoe. Tilting the bed sounds easier. Run it near empty or pump it out and check for sediment in the bottom opf the tank. Also change your fuel filter at the same time making sure it is installed in the correct direction, note the directional markings on the filter.