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Originally Posted by Old Geek
Assune you have a 300TD not a 300D (suggest you update your profile  )- it makes a difference in trouble shooting suggestions. Not an expert but - have you checked out the EGR system? It's possible thet the EGR 'plate' has almost closed, and if so that would be a good culprit for what you are seeing.
If it does turn out to be EGR related then you may want to consider an 'off road mod' that puts the EGR plate into a full open position.  |
It's the other way around. A stuck open ERG will cause a loss of power. The "mod" is to keep the ERG closed. Try disconnecting and plugging the ERG vacuum line to see if that helps.
BTW, I would recheck the line from the banjo bolt to the IP to make sure it didn't come loose someplace.