Got the Lean Cylinder code - how should I approach this? (1 Viewer)

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Update-

By passed rear heater and started replacing vacuum hoses as somebody suggested. All of the hoses were still fairly flexible and clean inside, but I noticed the v-hose going to the “gas filter” (as labeled by the hood sticker) was disconnected. I had to remove the TPS and the other connector to the left just to access the hard line. But the idle dropped down to 700-800 and the GD MF SMOKING STOPPED!!! Woooohooo!
Thanks again.
 

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