Yep, that's why they call it the engine cradle.
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there is actually no problem. it sputters because the engine has to start up and it may be the way you place the key inside the ignition. so don't worry because it isn't a big problem
You need to jack it up enough to take the weight of of the mount.
Flushing sludge from your engine is not a very smart thing to do. Almost every automotive technician will agree with that. Flushing out an engine causes all the sludge to drain down into the oil pan. Which in turn tends to plug up the oil pick up and causes engine damage.
the engine is locked up. Not good. Very expensive.
Good quality oil, no short runs, always get the engine up to temperature, regular oil and filter changes, regular engine flushes.