Q: Not Starting/ No Spark... Changed plugs, wires, coil still NOTHING. Help Please.

I purchased a used car from a private party recently. It was working fine on the way back home. Got the valve gasket changed. The car had a misfire in cylinder 3 and jerked a bit but i thought it was bc one of my engine mounts was bad so i had that changed. About 2 weeks in the car started to idle on me while on the highway and the check engine light started blinking and it started to slow down. I pulled over to the side and let the car sit for a lil. Tried to turn it back on and it wasnt cranking. The crank kept dying down till when I turned the key all the way and it didnt make a crank sound at all. I had it towed to a mechanic nearby and found out the car also has an aftermarket remote starter/car alarm in it. Also whoever put it in didnt do a great job and didnt solder anything they only entwined the wires. After bringing it home I followed a diagram and removed the bad wires and putting butt connectors on the affected wires. I am not getting any spark..

My car has 155000 miles.
My car has an automatic transmission.