Well yesterday i was driving for about 25 minutes, got home, went inside then a couple minuted later had to go back out. I satert my car and it idles lower and sounds more rough. I revved it up only 2,500 and the car shook a little. It seemed to be burning water/coolant a little. So then i didnt drive it. Later that night i started it up and it seemed fine. Then this morning i drove it around, got it to normal temp etc. It seemed fine/normal. Come back, turn it off, wait a minute. Then i start it up and it does the same thing. The exhaust smelt a little different,maybe sweeter. Then i let it sit for 10 minutes ans started it up again and it seemed better again. So i dont know. Im thinking headgasket but not shure. Any replies will help. Thanks. BTW its a d16a6 with p29 pistons and stock headwise, rebuilt about 6 months ago.