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I don't knowthe answer to some of your questions because my husband did the work. I know he just replaced the spark plugs and said that they really needed changed - same with the fuel filter. He didn't say anything about the condition. I know when the car is left running (warming up in the morning) you can smell gas and antifreeze. The check engine light doesn't come on or flash - my husband has checked the codes and it isn't "throwing" any codes at this time. He just changed the oil and filter not too long ago and I think he said there was antifreeze in the oil (I could be wrong about this) - I know he said there is oil in the air filter (odd). No obvious coolant leaks, only when left running or after driving you can smell the anitfreeze. Before he changed the thermostat he mention the fogging windows and wet floorboards - but I am not sure if that is still occuring. The other thing he has mention is there is a lot of exhaust when left running. I hope this is enough information to answer your questions.
Just realized I didn't answer all questions - the fuel pressure and compression has not been checked - not sure if he has the tool necessary to check it. I would have to check with him. The other thing he said is that two of the spark plugs aren't firing...