Car vibration when stopped

[mirving171]

I have a 2001 pontiac grand prix gt NA 3.8 w/ a WAI and flowmaster mufflers the car has 115,000+ miles on it and I have been feeling a strong vibration when the car is stopped at a light, I have changed the fuel filter, air filter(w/ a WAI), spark plugs, spark plug wire, sea foamed it, used Chevron fuel system cleaner, replace pcv valve, change oil(Penzoil High Mileage 10w-40), used Engine Restore(the oil additive) but there is still a vibration which makes me want to look at the engine mounts, is there anything else I could have missed? Any ideas on where the vibration is coming from?
P.S it's not rocking back and forth just alot of vibration main felt from the steering wheel.
Thanks, for the help in advance

 

[Kolton Lock]

Did you flip your front motor mounts? Mine feels like that since I did that

 

[mirving171]

No, I attempted to flip them one day I sprayed the lubricant around the rubber parts but I couldn't get them to flip when I turned them w/ the ratchet

 

[Kolton Lock]

It's possible you could have broken a part of the mount.

 

[00grandprixgtp]

my gtp did that and the motor mount under the oil pan was shot all the way feels like the car has an exhaust pipe hitting on something is as close as i can put it LOL i replaced it got one of ebay for like 21 bucks if i remember right

 

[KZOO3800]

I popped my engine mount on my 97 SE, it caused all kinds of vibration at idle and at speed. Replaced it and I was good to go, no more vibration until recently. Im guessing its time to install trans side mount I bought a year ago lol.



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