Lighting Bolt

Recently brought a Dodge charger *as is" with a 3 month warranty covering the engine and transmission only! After purchasing later that night car started after funny and wouldn't cut back on for 30 40 mins after shutting off and was smoking from the coolant jug I believe. Started back up drove fine parked till morning. Next day, take it for a ride on the interstate, once off I park with engine running it's rocking hard I cut it off check hood start back up but it won't crank. Take it autozone they diagnosed it said it need a ignition coil spark plugs, by the time I head home I break down have to get tow. Also lighting bolt symbol is on? Have I brought a lemon or is it something minor?