you need to get it hooked up to a scanner and se what's going on with it when it overfuels...could be a bad O2 sensor, bad injectors, bad MAF...but you wont know until you get a picture of what the engine is trying to do...are there any codes???

thanks for the reply what i got is my car runs with a miss after a while it starts blowing white smoke and the gas smell will blow you out of the car and then it stops smoking and runs good for a while and then repeats itself i dont know where to go and i have this other engine do you think injectors might be bad