Miss Fire cylinder 2 please help

[Mazda bpt]

hi i have CEL on for code P0302 miss fire on cyl 2. i changed plugs and wires are in good condition. Then i read somewhere to put 2 bottles of cleaner in to unclog injector so i did. The CEL is off now cause i took negative terminal off to reset it but i think it going to come on. Is it the injector?

 

[nick-osborne]

miss fires can be caused by bad spark plugs (new or old), injectors, vavles/ compression, and possibly air fitler or blocked converter

 

[Mazda bpt]

i advanced timing cause it was retarded and so we see what happens in morning if it fires up then need new belt and pump if not then something else wrong

 

[91Protege]

If its a P302 then thats easy, swap the #2 plug with the #1 plug, and see if the miss moves, if it doesnt, then swap the wire, and it doesnt, swap the injector, if it doesnt you got other probs. Before all of this, id ck for spark. If you dont got it, you got a bad coil, or cap/rotor. Depending on what year/engine you got, as you didnt list it.

 

[Mazda bpt]

have 97 protege with 1.5l going to swap later or put nos in till it blows lol. but anyways ya a 97 protege 1.5L Z5-de is engine i think. the timing belt is off about 1/4 inch too i found out when looked at it. Is timing belt only problem hopefully? There is oil in plugs cause the timing way off so once it runs for while and shut off oil gets burned and start it up again and no oil so i think it geting passed rings cause timing off