Hello all, i recently bought a '03 Sierra with a 5.3. The back window came with a PerformanceTrucks.net sticker. The previous owner didnt mention any thing about posting on the forum so that leads me to believe that the owner before him did all the posting. If anyone remembers the truck please point me in the right direction.

 

Welcome bud !

Nice truck , not sure who's it is but I'll help ya bump this up for any info .

Any other mods under the hood or interior wise you know of ?

 

Just a cold air intake with a custom x-pipe. I have some new ls6 valve springs on order to install since the dealer said I should check my stock ones due to a misfire problem that I've been chasing down for a couple weeks now.

I also have a 2/4 drop to add to the truck. It already has 2in drop shackles so I'll be pushing a 6in drop in the rear.

 

Give us more info on your miss fire , maybe we can help .
Any DTCs besides 0300 ? Is a certain cylinder(s) showing misfire ?
Plugs , wires, coils , coil wiring harness have been verified OK ?
Fuel psi checking out ?

 

I made a post in the gmt 800 & older section about the misfire,it seems no one can help

 

New plugs, wires, tested all coils and replaced one, new map, new maf, new Delphi fuel pump. I took it too the dealer to run a diagnosis, they checked everything and came to conclusion that the exhaust valve springs on cylinders 1&3 are bad.

 

Not sure about AR but In texas there was a truck or 2 similar to that on the site.

Did you purchase this private party or from a car dealer?

 

Private party
It also has a roll pan and a shaved tailgate

 

welcome!