6.5 backfireing
 

backfireing?? what cud be doing this the only time it dose it if im at 2000 2500 rpm

Broken valve spring or misaligned rocker arm?

that dont sound right to me i would here something if that was the case like knocking taping somthing like that

Backfiring don't sound right to me-the only way a back fire can happen is if an intake valve is open during a compression or power stroke when they should be closed.

If you can figure out another way for an intake valve to be open when it should be shut I am all ears.

A broken valve spring that has broken very close to the first coil will still hold the valve shut until speeds get to high and valve float occurs.

If a plastic rocker arm retainer broke,2 nearby rockers could interfere with each other and with how noisy these engines are it is unlikley you would hear anything-you should notice a miss though.

A stuck open EGR valve could also have a symptom like a backfire if exhaust pressure got high enough.

it sounds more like a sputter to me

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i had air in the lines and just found out the filler tube poped off put it back on and now this is happening

A bent or cracked valve could be part of the problem?
I can't hear the noise so I can't come up with any ideas outside of what you describe the problem to be?

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Filler tube as in where the fuel cap goes?

A plugged cap vent can cause lots of running problems-miss or fishbite might be 1 of them.

where dose the ground go on the filler its just dangeling

Ground goes to the body,it is to prevent static shocks that can ignite vapors.

ok thanks the sound im hearing is not a backfire its more like the truck is sputtering then it stops idk what it is its driveing me crazy :argh:

i recently had the same issue.. hard start, runs like shit and then dies.. check your lift pump or oil pressure switch