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The DPFE thing is fairly common. Mine did this last month. Gave it a shot of sea foam and it cleared up. I have replaced it twice so far.
If you have a decent OBD II scanner, it should show if you have a miss. It would show up as low rpm or hi rpm miss bank 0 or bank 1. It won't tell you which cylinder is affected. (The ECU on these trucks are not very robust in the control department) I just replaced the boots after talking to a mechanic that works on local PD cars. Then replaced 1 coil after disconnecting them one at a time until I found one that didn't affect the idle. OBD ran clean after that.
MikeH
If you have a decent OBD II scanner, it should show if you have a miss. It would show up as low rpm or hi rpm miss bank 0 or bank 1. It won't tell you which cylinder is affected. (The ECU on these trucks are not very robust in the control department) I just replaced the boots after talking to a mechanic that works on local PD cars. Then replaced 1 coil after disconnecting them one at a time until I found one that didn't affect the idle. OBD ran clean after that.
MikeH
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