Good call on the engine mounts, this problem has had a lot of TB owners scratching their head. Hope you used genuine GM mounts, aftermarket mounts tend to crush too much sending you back with the same problem you started with. With aftermarket mounts, the engine will not be as high as needed, the rubber isn't as stiff. Seen this many times. The other thing to check is you tranny mounts. Engine and tranny mounts are usually the culprit with vibration while in gear and stopped with TB's. What type of plugs did you install? Have you cleaned your throttle body?
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