Just to start off , Hi I'm new to this forum and will be around since I love my chevy...

Anyways to the problem I have....

My truck is a 2003 Silverado 5.3 Ext Cab 2WD and when I'm driving my truck sometimes my truck moves slow when I give gas until the drive shaft locks up
and just today when I was leaving my house my truck felt like I was towing a car and wasn't going as normal , if I floor it then I get my power , but if I curse I get this problem .... Also when I let go of the gas it decreases speed fast like there is a lot of weight on the rear end... Any Suggestions?

 

Sound like maybe your brakes are dragging....i/e Calipers froze up.

Inspect brakes and E-Brake for proper operation.

 

No it's not the brake or E-Break my dad checked that for me and that wasn't the problem feels like it's coming from the drive shaft to rear end , and transmission is shifting fine in all gears

 

When you give it gas to get it to go, does the engine race? Does it do it all the time? does it do it only when cold?

 

No it goes as normal when I floor it , but cursing speed feels like a drag...

It does this from time to time ..

This happen to me also in the summer so I don't think it has to do with the cold.