Hello I really don't know much about cars so I hope some of you can help.
I have a 1998 mustang
(172k miles) w/ 3.8 v6 and have recently had some trouble. It all started when my wife called me and told me my car died while driving down the freeway it later started back up and she made it home. When I drove it the next day to see what was going on it wasn't hard to start but it didn't start right up and it kinda chugged a little bit.
I drove it for a few minutes and then decided to turn around and when I put it in reverse white smoke started pouring out from under the hood on the passenger side but when I got out and lifted the hood it had already gone so I don't know where it was from. My car doesn't drive well at all and has lost a lot of power and when I press the clutch to turn or slow down it dies most of the time. My exhaust is loose in the middle under my car but has been since my half A$$ clutch replacement so i don't think that is it.
It was checked for water and antifreeze and it didn't have any so it was added and seems to have NOT lost any and the oil it seems. I didn't see any water or bubbles and it seems to be pretty clean. There is oil in the air filter but not a whole bunch. All of these things started at the same time so I assume they are related.
My questions are
1) is it probable that i have a cracked head or gasket and what would that cost if I decided to go it alone and fix it myself
2) what are some other things that could cause this. And two other things there is a hole with some sort of fitting that looks like it's broke going into the firewall on the passenger side but no hose or wire or anything like that connected to it and my heater stopped working.
If you could help me that would be great if you need more info please feel free to ask.