I took off the oil cap and no smoke (at start and while reving). I looked at the exhaust gas and no sign of blue smoke either.
The car idles smoothly but then drops to like 100 rpm for about 5 sec and then rev's back up as if the ecu is compensating the fuel ratio. When the rpm's drop that low is only shaky then. Is it possible that it might be an o2 sensor?
I cant see it being the rings if this problem happened overnight. Car ran strong the whole time. Im gonna run the compression test, and leak down test on monday and let you guys know whats up.