Rough Idle When Hot!

[96Dieselfan]

Mornin' fellas. I have a 96 PSD f250 with about 74,000 miles on her. When it gets hot, when I decel like on an off ramp, the idle gets rough and then smooths out in about 10 seconds.
1. It has about 2,000 on Rotella T15-40 oil, but the oil change was about a year ago. It hasn't been driven a lot last year.

2. The dipstick showed about a quart high a few days later after she cooled down.

3. I ran it up to about 2,500-2,800 rpms for about a minute and a half the other evening and pulled the dipstick. It had several small bubbles on the stick.

What gives? Change the oil, clean the IPR, replace the IPR? (Where can I get a diagram of where the IPR is? I also heard the Craftsman brand of deep socket is the only one that can reach the IPR.)

Thanks,
Mark

[White95f250]

Do you notice any hard shifting like it has a shift kit? Truck must be in amazing shape for that many miles on it!

Small bubbles on the dipstick is normal after running an engine.

Are you getting any engine codes too?

[96Dieselfan]

There is no hard shifting, it goes into gear just fine for a diesel. Somebody else on another site suggested changing the oil since it was a year old first. Then clean the IPR if the oil change didn't take care of it. Is it a pain to get to the IPR? Can't find a diagram anywhere to give me an idea of where it is! Yeah, it's in great shape otherwise. It was my Dads from '96 to 2009 when he died, then my brother inhereited it. He only put about 2,000 miles on it, then a couple weeks ago I bought it from him.

[96Dieselfan]

P.S. I haven't tried to run a diagnostic on it. I am going to get one. Which one would you recommend?

[White95f250]

Found this through google http://www.dfuser.com/Install%20Guid...0Regulator.pdf

Change the oil and let us know how it runs.

[White95f250]

Also check your trans fluid level and see if it looks/smells burnt. Your problem could lie in there too if this only occurs while driving.