Sputters, stutters and will not start

Now for my second question I also own a 2002 P.T. Cruiser that was purchased by my neighbor who drove it like he had a lead foot While continously running it out of gas or on very little gas, let's just say it was never filled pass the quarter ta. Nk mark, and he drove it hot or until it overheated. Finally the car died and wouldn't start again. So we repossessed the car to find out that it needed a new waterpump. We replaced the waterpump, thermostat, and the Sparkplugs. Again it was up and running without any issues. About 2 weeks later it was again overheating and was having a hard time starting. Continued to drive it Keeping it within a 10 mile radius of where we lived, figured it was too risky for long distance traveling. Each time we started it We noticed that it was taking longer and harder to start. Near the end of this adventure When the motor wasn't even hot and you would start it, it would automatically start shooting water outthe top of the radiator as if it was hot, but it wasn't. We got a few more days of driving it but having to keep short distance along with refilling it every time we stopped. Then it just wouldn't start, it'll crank over but won't start. I've checked the coil pack and compression, as well as the fuel pressure. Which all came back just fine with no problems. And there's no different sound either, it sounds normal but won't start. Also before I forget when we fixed it the second time it had straight white smoke coming out the tail pipe and we had bought this stuff from Auto zone called Blue Devil. But now it won't start, so if I could get some help on this I would greatly appreciate it, and when I figure out the Izuzu Axiom issue I will be glad to update you on that as well Thanx.