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Rough Idle When Hot!
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.)