Only has about 126k miles, but the engine has a rough idle. Even worse, the idle will bounce when stopping near a stop light. I've tried many things to correct this, but with little change.

So far I've replaced...
Idle Air Motor
Throttle body gasket
Plenum gaskets
EGR gaskets
wires
plugs
1 coil pack

I've also replace a good deal of vacuum lines, cause they literally broke from the touch of my hand. This piece in the picture was replaced with a T split. No idea if that was a smart move, cause I have no idea what it does. Few years ago I also replaced the intake manifold gaskets as well. There's no check engine light. I'm stumped as to what's going on. I've tried to take a can of carb cleaner and sprayed all over the engine to see if the idle changed. Nothing.



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