LOW RPM MISS in 2000 Silverado 6.o

[nenis44]

idles rough then clears up after 2000 rpm ,scope says cyl. 2 - 6 -8 all on the passenger side-missing at idle ,installed new o2 sensor -swapped wires and coils -new plugs -no change , i'm being told maybe its a warped intake causing vacuum leaks ,truck does have about 190,000 miles.............any thoughts appreciated

[farmtruc]

regardless of the miss, that truck probably has the old orange intake gaskets on it; good idea to get the new improved green intake gaskets.

[00shortbox]

Ditto with what Allen said, those orange gaskets were horrible for causing vacuum leaks. What are the fuel trims at at an idle??

[nenis44]

changed to green gaskets ----no change , fuel trims ?? , still idles choppy at idle and runs on all 8 after 1500 rpm

[bstill]

Take the valve covers off and check things out. The 5.3 in my blazer was doing something similar. It had bent push rods and a couple of loose rocker bolts. Not saying this is your problem but, it won't hurt to check.