01 Ls v8 HELP

Dougmcmullen

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01 ls v8 getting rich and lean codes also random misfire. Replaced num 4 plug and pack. Rough idle any ideas where to start?
 
That's really not enough to go on. One possibility is that one of the secondary timing chains has jumped one tooth (due to failing tensioner). A compression test could rule this guess in or out.
 

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