I have a problem I just change the modular, coil and I'm still having problems under normal driving conditions. the car runs way better and smoother than I did before with the new parts, but is still sputtering sometimes under normal driving conditions, but not all the time only sometimes. when it's sputtering if I hit the gas the sputtering in goes away. could this be my a mass air flow sensor acting up? with no malfunction codes? how can I go about checking these things out? any help would be grateful ,Thanks.