I can be driving 60 mph and slow down a lil bit then start to speed up and the truck wont speed up its like it just lost power then sometimes it will just readjust its self then gain power,or you can turn the key off and back on as fast as you can and it readjusts itself. This will happen at any speed mostly when I start to slow down, I have changed fuel filters and such, I have tried additives to clean injectors
Also I have new clutch pressure plate throw out bearing and slave cylinder and my truck doesnt want to go into 6th gear,Sometimes it shifts fine sometimes its kinda hard to deal with. Just turned 100000

 

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This sounds like the same symptoms I had. It was the injector pump. I too could "fix" it by turning off the ignition and restarting it. If it's the IP, it will eventually die and leave you stranded. Have you had any sputtering, extremely smokey starts yet? I had the injection pump replaced before it completely failed along with the lift pump. If you can do it yourself, you'll save $$$$. If not find a shop that will do it. My dealer charged me $3,300 for both pumps and labor.

 

Hello. Could it be possible that the electronics throttle control are kicking the bucket. I have heard of flaky sensors not telling the computer to kick up the pace from time to time.