Firing order for 1995 1298cc skoda felicia?

I am trying to establish the firing order for a skoda felicia 1.3 lxi. It keeps popping when running as though the ht leads have been switched about.|||Check with you local auto part store they may be able to help you. Also you may be able to find this information on line by going to the mfg. technical service .|||1-3-4-2 . establish No 1 cyl then follow the leads good luck..might also have an air leak????