The car will backfire only in drive at low rpm ranges. When park and neutral the car will rev fine. I located where the backfire was coming from and that was from the mass-air flow sensor area. I replaced the coils spark plugs, do I need to replace the distributor cap and rotor. Since it's a euro model LH/ ignition type it's so hard to find the distributor cap. Have taken the car to a european shop and still the same thing. If that's not it what is can it be? Any input would be greatly appreciated. It's driving me nuts.