[GTP Dad]

If the car is backfiring through the intake there may be three possible problems. One there is a coil misfiring and causing one of the cylinders to fire at the wrong time. Two there is a sticking valve or three a bad camshaft. Start with the coil and then do a compression check to see if you have a bad valve or bad camshaft. You can also pull a valve cover and turn the engine over watching to see if the valves move properly if they stay open or do not open at all then the cam is bad. Try the coil first.