rough idle

[nitrotommy]

I have 3 300xs (2009) 1 motor won't idle, you can smell raw fuel, checked plugs, all black, coils and wires good, fuel pump and filter changed, what I found when i get it to start it runs perfect above 2000rpm, also at 4000rpm it shows 16gph and the other 2 show 10gph, also higher fuel consumption at 5000rpm

 

[racerone]

Doubt that a set-up like that is meant for " at hoime repairs "-----Have a dealer run a compression test.

 

[ChannelCat]

i would check the air and fuel pressures. it seems possible that one of three diaphragms may be ripped (you could check the tracker valve on your own probably)