Discussion Starter · #1 ·
I have a 1996 F250 Turbo diesel, 7.3L, manual trans. It runs well cold, but after heating up say on the highway, when I decelerate, like going down off ramp, it idles rough and acts like it wants to stall, but doesn't. It will do this rough idle for about 10 secs, then smooths out. It has about 2,000 miles on Rotella T 15-40 oil, but the oil was last changed about a year ago. Don't drive her much. It has about 75,000 miles on her. What gives?