When I left work yesterday, it idled rough at start up and then ran rough on the way home. If I got on it hard, it would puff some smoke, not sure if it was black or blue. around 50 mph it at 1500 rmp's, it would vibrate but if I got on it, it would stop. Put some Rev X in the oil this morning and some HSS in the fuel drove about 10 miles, stopped at a stop sign, barely pulled out. nursed it home. at 50 mph and 1500 rpm's icp was up around 4000. This truck is mostly stock with 165k miles. It has an EGR delete, DC power alt, FICM by FICMrepair.com, new batteries. new u-joints and carrier bearing in rear, and recently changed the trans temp sensor. Fuel and oil filters recently changed. Air filter cleaned. Turbo was cleaned when the EGR delete was done 2 years ago. any help would be greatly appreciated. no codes or service lights

 

update: So I let it cool down for about an hour and a half, drove 2.5 miles, ran rough, but ran, turned around and came back and as I got close to the house it started shaking again. all of this about the time the trans came up to temp, but I think that is a coincidence. Then it looses power again.