SOURCE: Steering problem
when turning you hear the sound? yes it may be a tie rod, cv shaft and or alignment issue. and as for the shaking... check your tire balance.
SOURCE: engine codes p1133 p0171 p0507 p0131 all at once
Per your description, it sounds like you have a vacuum leak.
Check all vacuum hoses at the engine, make sure no hoses are disconnected, cracked or damaged.
Disconnect each hose at the source on the engine and see if the engine idle stabilizes.
Let me know what you find and we can go from there.
Regards.
SOURCE: Recurring bent push rods/knocking engine- ideas?
Rocker arm could be wobbling if pivot is worn. This would cause misalignment and bending. Only other thing I can think of is that the lifter could be getting stuck "pumped up" and forcing the rod to bend.
SOURCE: I have heard a knocking
Well, if the knocking noise is like once a second, it could be a camshaft bearing.
Some engine builders consider a knocking in the engine as a failure in the engine and recommend a rebuild, if economically possible.
How does it drive?
SOURCE: Recurring bent push rods/knocking engine- ideas?
I have seen this myself on a 3.4L (2.8, 3.1, 3.4, 3.5 & 3.9 are all mechanically the same engines). The valves may have a varnish build-up on their stems causing them to stick in the guides.
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piston noise, very common and nothing to worry about. Many GM TSB's about this noise.
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