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Discussion Starter · #1 ·
After i have run the truck at highway speeds(55-65mph)in the morning to work.I pull up to the gaurd gate and I get this real muffled engine noise at idle in drive. Once I start to accelerate it returns to normal. What could be causing this?? /ubbthreads/images/graemlins/shrug.gif

Thanks in advance for any info,

JB
 

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Discussion Starter · #2 ·
Could it have something to do with the EGR valve? I just bought a new one that I'm putting in tommorrow so I'll se what happens...
 
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