97 z71 R/Bank fouled plugs

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S

slic

Guest
Have been chasing this fuel problem for some time. Have rplaced
injectors,pressure regulator,all 4 o2 sensors. Runs good for a while, then
check engine light comes back on. This time all 4 plugs on pass. side were
black and fouled. Drivers side ok. Any help out there?

 
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