edwin bravo

Hey I’m edwin, I recently bought this 2004 rx8 with 150k miles on it, I was told the engine was blown and took to a mechanic and he fixed it up, it was missing hoses apparently. Anyways the car ran just fine changed it’s oil and filter and coolant was good, one month later
my car stopped on the highway and smoked out everywhere, I noticed the coolant box was empty, as I tried filling it up ot disappeared and no leaks! I bypass the car and ran it back home, but each time I turn the key it just automatically turns off unless I put gas in it. Idk what’s the problem anymore and I don’t have a lot of money on me but basically there’s coolant in my oil pan etc.