90% chance it's the crankshaft position sensor, that what happened to my car last year. Not too bad to replace and is not particularly expensive, either.
On the ignition module mounted on the driver's side fender well, there is a green cable; trace it back to the back side of the engine, near the top, and it is held on there with one small bolt. You sort of have to get to it by feel; I reached up from beneath, with the front of the car on small ramps, while laying behind the front tire. There is a plastic cover that snaps over the actual sensor. Good luck.