Pontiac Bonneville Problems

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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.

I have a 1992 Bonneville SE with the 3800 engine in it. When it gets cold or damp outside it will not start. I have replaced the spark plugs and still the same problem. Did notice that when it was warmer out and the car started, if you tried to accelerate quickly the engine would buck and backfire. If you accelerated normally it would go fine.

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