[thebigburly]

I just bought a 99 5.2 1500 drove it from nashville to memphis no issues and once i got home between 25-45 it would lose power until i hammered down on the throttle or let off and let itself catch. took it to autosnacks and they told me i had two miss fires so i replaces plugs and wires check engine light went off and i still have the issue. ive been told it could be injectors or fuel filter...before i spend any more money just wanted to know if anyone has had a similiar problem and could save me some time and money thanks.
truck only has 121,000 on the od

 

[Hugh Jassole]

when was the last time the pre cat O2 sensors were changed ? They are a wear item and should be changed every 60K or so. They can also cause all sorts of weird issues before the ever light the CEL, or throw any codes. You mentioned tune up parts were done recently, you probably should do those too.

 

[Lazarus Truck]

I suspect a clogged cat.
This can be diagnosed with a vacuum gauge (rented FREE). There are videos on Youtube on how to do this.