My truck surges while goin down the hwy
 

I have a 2006 ford f250 regency badlander that is bone stock. Here recently I have noticed that when I'm cruising down the hwy goin anywhere from 50 to 65 mph my truck surges pretty bad. If I ease on the throttle it will get worse until it shift gears. I've done all the proper maintenance on it as needed and I use Lucas fuel treatment pretty often on it but it still does it. I'm out of ideas, any suggestions would help.

it could be a dirty turbo or an ICP sensor, does it do it at idle? does it have any trouble starting when cold or hot??

It idles fine, it does have a eought cold system if it gets below 50 around here. And if I'm in a hurry and don't let it warm up all the way the rpms will jump up and down a little but while speeding up

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Rough cold start not system