Does a transistor reduce current flow?
NPN transistors are mostly used for small signals and low currents these days. Use an N channel mosfet instead. Many off the shelf transistors will not be able to supply enough current for your igniter. 
You need to switch the ground, not the high side.


The reason is that the voltage at the gate is in reference to the transistor emitter, so it needs to be connected to ground (to put it simply). Switching the GND instead of the V+ seems weird, but it works fine and is a very common arrangement.

The circuit (with mosfet) will look like this:







simulate this circuit &ndash; Schematic created using CircuitLab
Edit: Added a pull-down resistor to make sure mosfet stays off when control is disconnected.

Note: you will need to pick a mosfet with a low Vgs(on). Get something less than 2v Vgs(on), and which can handle your current and you should be golden.
Example: IRLI2910PBF