1992 Nissan Pickup (D21) Questions

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This truck shift through all gears just fine until I get up to about 50mph.
compression@ 130, injector tested and have plenty of spark
No known vacuum leaks. Dirty throttle body? 359000 miles. Attempts to adjust idle at throttle body resulted in rough idle from a smooth 1250 RPM formerly at smooth 900 RPM except for flutter at running/cruising speed.
Changed EGR on 92 2.4 to try to eliminate flutter. Idle has jumped to 1500 RPM from a steady 900 before. No response from throttle body adjustments.
with the truck running I can shift thru all the gears and also from 2 to 4 wd it does the same thing I don't have to use the clutch and can go thru all gears with no kind of grinding or hesitation, it is like the clut...
Just got it and it didn't come with a manual.
im getting 10 mile a gallon
I CAN REPLACE THE FUSE IT WILL START, AFTER 5 SECONDS IT BLOWS AGAIN. IS IT THE FUEL PUMP OR THE RELAY GOING BAD?
The odd thing about the whole thing is that when it makes that noise I usually turn my lights on and off then it stops or when I turn the heat off it stops. But it does it when it has sitting for a few hrs. It last ab...
When you first take off it will aputter and then catch back up then sputter some more