Pontiac Bonneville Problems

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2004 Pontiac Bonneville Has Vibration From Engine

2004 Pontiac Bonneville SE

Engine size = 3.8L V6.
Repairs: Front motor mount changed, all motor mounts were loosened and then tightened. Spark plugs have been changed, platinum plugs were put in.
Question = I have a vibration from my motor, I feel it mostly when I am stopped at a red light or stop sign. I can feel the vibration in the seats, the steering wheel, the brake pedal, right through the whole car. It's like I am in a big truck.

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