Yesterday driving home from work my truck started loosing power a couple of times for about a minute at a time. I was crusing about 80 mph and it just lost power until about 55 mph and it kicked back in and ran normal. Fuel pressure was at 11 psi, boost stayed at about 10, EGT was about 8,000. There were no signs of additional smoke and the temp gauge (dash) started climbing from 190 to about 210. The go pedal had no effect on power. Any suggestions what to check first? I have 308k on it and just made my last payment yesterday! YAHOO 
Thanks for any suggestions!

Thanks for any suggestions!