My 99 Nissan Frontier did that and it was the EGR valve. Getting up to speed was fine. Running 55 and trying to hold it the truck would shake. I first thought I had a tire out of balance. Hard to hear those 4 cylinder engine. Accelerate and engine runs fine.
The Nissan has a tube with threaded plugs in it. I took one out, filled it with sea foam while the engine was hot. Let it sit over night. Didn't see much change but in a few weeks it was back running fine. The sea foam made lots of carbon come out the exhaust for about a mile too.
You may have another problem but it sounds like EGR.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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