I've been suspicious of the IP, since I've tried pretty much everything else. Bench tested IPs are not inexpensive, I'm sure, so I'm trying to not overlook other, more simple tests/fixes.

Brandon (OR) looked at it last year - wondered at first how we could drive it at all - tried some things, then scratched his head, and mentioned he put a re-calibrated IP on his, and he couldn't be happier...

Oh, and I should include: 82 300TD 345,000 miles

Haven't really checked anything to do with the turbo myself. I will say, though, she's "all ahead slow" way before the turbo should have anything to do with it...

So, where does one get a re-calibrated use IP, and is this probably going to be the way to go (once we've ruled out everything else)?

Someone also mentioned removing the ALDA altogether - just to see if it's the culprit - does doing so make any sense?