ok guys and gals...i am new to the firebird world...and I joined in with both feet this time

...I bout a 94 manual v6 and a 95 automatic v6 this past week..the 94 has been sitting for 6 mo..I bought her as a police tow..bad waterpump....I did a gas additive to remove any water to the gas..it ran /Backfired like heckwhen I used starter fluid and then stalled...started up the next am on a cold atart.....now she will only back fire....SOOOO I am thinkin maybe I should try and take the working coilpack from the running 95 and place on the 94..BUT getting the coil pack off is tricky...suggestions please

...yes I am a female...no wise cracks guys..I do like tinkering..my hubby thinks I have lost my mind...