95' Dodge Neon Stalls Out After Around 15mins Of Driving!

Please give me some input on to what might be the cause for this problem. My car stalls out after around 15mins or so of driving and will not start [i:d21b8c5785]unless[/i:d21b8c5785] I take the key out of the ignition and re-isert it again to crank ignition. After I start it up again, it'll stall out almost immediately while driving less than a quarter mile down the road. I have to repeat the procedure over and over again until I eventually make it back home. The mechanic at the dealer told me it was my computer so I went and got a new PCM and changed it out. It didn't solve the problem. That was a $250 part! Not only that, it was $240 in diagnosis labor charge! Now, $490 later, I'm back to square one! I really don't have the money for this trial and error baloney. If thats all I got, then why should I pay someone to do what I can do already? I'm a good a guesser as any and cheaper too! If anyone can shoot me in the right direction or have experienced this type of problem, please give me some input. Thanks a bunch for any replies on this thread.