2000 Infiniti I30

Suspension problem
2000 Infiniti I30 6 cyl Two Wheel Drive Automatic 58000 miles

Ihave a 200 infiniti I30 that rides like a truck. I have changed the tire pressure from 30 to 32 to 35 pounds of air with any change in the rough ride. All four tires are Goodyear with 38000 miles on them have had the front end aligned and tires rotated. The tires have no bumps or ripples. What can I do to soften the ride with this car.
June 6, 2008.

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