Quote:
Originally Posted by ishmael_zargonigis
i know i'm over 6 years late on this topic but for future individuals who view this i wanted to get in on the action. I had the exact same problem with my '94 SL1 where it would sound like a big-rig truck until the engine warmed up and then it would be fine. It actually ended up being the motor mount located on the left side of the engine block next to the belts. i found a replacement at a junkyard i frequent when i need parts and its ran great and quiet ever since
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It could also still be a manifold issue, most likely gasket, when the engine warms up the manifold expands sealing the leak up.