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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
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.
Ditto with what Allen said, those orange gaskets were horrible for causing vacuum leaks. What are the fuel trims at at an idle??
changed to green gaskets ----no change , fuel trims ?? , still idles choppy at idle and runs on all 8 after 1500 rpm
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.