hello, i have a 97 mercury villager van and the engine light is on and when you come to a stop it also has a miss in it. i took it to be looked at and fixed and where i took it to said that it needed a tune up and they did an board coumpter analysis and a 3 part fuel system cleaner cleaning the injectors so i had this done for $653.29and the engine light and the miss was gone so then about a 2 weeks later the light and the miss was back again and it would not turn over so i took it back to the place and thy did another computer analysis and said that it was the r&r ecm part that cost me $926.00 so they did this work and it took 3 days to get the part so when they was done i went to go get it and that night the engine light and the miss was back. now i dont know what to i dont have any more money to fix it and i am a woman so i am affraid that if i take it back to them they will say it is something else knowing that i dont know what it is. any suggestions ?