you need the choke adjusted
try to get a new ignition rotor
Follow the wires from the spark plugs and they will go to the distributor unless the engine does not have one and has a coil pack.
Not if it's a diesel. Diesels don't have spark plugs remember..
When you replaced the plugs, did you check the compression? Did any of the plugs look different than the others? Low compression in one cylinder can cause misfiring. But then, so can a faulty distributor cap.
local library
If you have spark at all but one plug, the problem is with that plug, wire, cap or rotor.
Is it a brand new distributor ? If not then replace the module and pick-up coil in the distributor that you have.
change distributor cap and rotor
check your coil, and your distributor, and ditributor cap, along with all wires and connections.
Distributor module and crank position sensor
The Mazda 5 does not have glow plugs. Maybe you meant spark plugs?
You don't. It has a D.I.S. ignition system and has no distributor or rotor. There are three coils mounted over spark plugs under coil pack cover (center top of motor) Each coil fires 2 pistons. They are not replaced as a tune up item. They are only replaced if faulty. Spark plugs should be replaced every 15,000 miles.