Help,turns over but won't run

Ok i cut the Cad. converter off and flex piped it.....its not quite big enough .....have to buy reg muffler pipe ......and i have tried TCC plug on trainee......Before i tried any of it it would run 2 or 3 miles stall and start and run in park......but rough......if i put it in drive an applied gas it would really act up sputtering and just wouldnt go.....I'd let it sit between 10-15 mins and start it and it would go a few more miles 1 or 2 not much...........So today i unplugged the Tcc and drove it just a little around the block it didnt stall out but ran rough......Then i said ok ......and cut cad. converter off and have flex pipe there.......took it to go around the block it made it about 1000 feet died and had to tow it home with truck and a rope lol......It will turn over but it wont stay running at all now ..........Will the fact the flex pipe isn't quite right make it run like that? anyone who can help plzzzzzz let me know what you think!!!

First check the condition of the ignition system and test it to see if its working properly

I had a similliar problem I changed my cranksensor prob salved sensor is about $20 at auto zone.