Looked thru some older posts and couldn't find this issue. I have a 97 F350 PSD that has 188k and ran fine. haven't really had issues w/it @ all. A few weeks back while driving the CEL came on and it ran very rough, had no power throttle to the floor no RPM gain. Limped it to a parking lot and was going somewhere so let it set. Came back several hours later and it started up and ran fine. Drove for a few days then same thing happened. Basically parked it to check it out. Gettin ready to vacay and want to take truck, but don't want to repeat. replaced fuel filter a less than 1k ago, had either a crank or cam sensor (forget) changed few years ago on recall, had codes pulled (KOEO) w/a good scanner and nothing there. Looked here and pulled off IDM checking for water, and nothing there. Ne ideas on where to go next?