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 - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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