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back pressure from something!

1K views 0 replies 1 participant last post by  black250 
#1 · (Edited)
back pressure from something! please help me!!!!!

when i pull a hill under a load it pulls fine.when i top hill and let off fuel it makes a weird back pressure noise & sometimes smokes black smoke.its an 04 6.0 with 116,000 on it. thanks for any help. i dont know if i am posting properly.
 
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