I have a 1994 mazda b2300 pickup and a week ago my check engin light came on so I had it checked out by a local mechanic he put it on the computer and it said it was a bad coilpack one cilinder wasn't. Sparking or should I say fiering so I replaced the coilpack myself .now a week latter the check engin light comes on again .so I have no clue what eles the problem is .