engine running rich

[brandondan1]

Hi, I just recently replaced my coolant temp sensor, coolant level sensor, coolant, O2 sensor, and fuel filter. My idle has gotten a bit smoother however startup is still rough and I'm still running rich(i think) I really need to fix this soon because my Nox levels are too high to pass emissions.

I do notice that under heavy load i can hear my exhaust rattling.. could that be a shot catalytic converter? Also, the last time i troubleshooted my ignition problems, I pulled the spark plugs and found out that they were loose and had some oil on them. Is this because I need a new valve cover gasket or could the leak be coming from somewhere else? I also have oil in my coolant so I'm guessing I need a new head gasket, but are there are any reasons why I have oil in my coolant?

-Brandon

[EWAustin]

Oil in coolant can be one of two things.

1: Blown headgasket.
2: Some dummy put oil in your coolant.

[porsche gt1]

blown gasket, valve seals if you have oil on your plugs, But since you have coolant in your oil Headgasket would be the best bet. Depending on how much coolant is in your oil I would get it fixed before you overheat and do more damage.