420 SEL running rich

[shadetree77]

hi all,

finally got my 86 420sel running (had to replace camshaft, did timing chain, rails, etc.). when i pulled the plugs they were all covered in soot (from running too rich, not oil) when the engine is warmed up there is a fuel smell from the exhaust, also has a rough idle (idle is steady at 650 rpm but the engine is shaking a bit) also it seems that it has no power. so i am wondering what would cause it to run rich...would an air intake leak cause it to run rich? i am planning on checking the mixture via the x11 connector later this weekend and also replacing the o2 sensor. I don't think it would be an injector since all cylinders are running rich; any input will be appreciated

thanks