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Dose is smooth out if you bring the idle up a little?Dose it appear to be running on all 8 cylinders?
So it is a slow idle that is causing it to seem rough?
So you have a carb engine, the 1989 should be fuel injected. Are you sure you have a carb?
Are you sure its a 1989?
Okay can you take a picture of the carburetor and post it here so I can see what type it is?
Well if you have a carburetor you should be able to adjust the idle speed and bring it up to about 750 RPM and it should idle smooth if your running on all 8 cylinders.