like stated, after you crank the truck and start down the road, it stumbles all over the place! kinda like its loading up on fuel, but after about 5 minutes or so it clears up and runs fine! i did have a mishap with the 05 DBW throttlebody matching the 01 LS1 intake, but fixed that and also , why would the passenger side be rich and not the driverside, the plugs on the pass. side was black , and the plugs on the driver side were clean???

 

Possible bad intake gaskets?

 

i had something similar in my car, ended up being the O2 sensor wires got too close to the exhaust, burned them and shorted them out

 

i put brand new intake gaskets on it GM gaskets at that!!! im thinking it might be an o2 sensor maybe. but the thing is when it gets warmed up or after about 5 minutes it clears up

 

which injectors are you using?

 

stock 28# is what allen nelson told me i have and he tuned for!!!

 

did you do new head gaskets, or the same ones still on there?

 

Can you do any logging?? If you can, make sure the O2 mv's are oscillating. Guess an O2 sensor could be having some heater problems.

 

new GM headgaskets!!! i dont have any tuning capabilities only a Nelson Tune!!! Is there any difference in a front and rear O2 sensor, which one rattles when you shake it, rear i suppose, because thats what was in the passenger side that was very very rich on the plugs

 

Sounds like a 02 sensor problem to me.. My ls1 did the same thing when one of the 02 sensor wires touched the transmission cooler line.. it would run like poo until you got it warmed up and then it would be fine. we kept running it and it just got progressively worse.. i finally got around to logging it and passenger side 02 was not oscillating so we checked it and sure enough..