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Engine/Transmission (1998.5 - 2002) Truck misses @ 15-20 - Dead pedal?

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2nd Gen Non-Engine/Transmission intake discoloration

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I'm not sure if this is qualifies as dead pedal or not. Any help appreciated!



I have a 2002 ETH with a 6 speed and 75k miles.



When cruising down the road at 15-20mph, I can hear/feel the motor rpms dropping and then surging back up. The entire time my foot is very steady on the throttle and I can see the RPMs fluctuate on the tachometer. It hasn't done this at any other speed except for 15-20, I usually notice the problem in 25mph speed zones.



Replaced APPS within last 10k miles.



No ODBII codes



Problem is more pronounced with Edge EZ but still exists without the box.



Idle speed is very consistant and doesn't hunt around much.



Replaced lift pump within last 10k miles. I have an LED that goes off when the fuel pressure drops below 5psi so I know the lift pump is working...



Thoughts? Thanks.
 
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