jacobs electronics coil........car not starting!!

ok, my car still isnt starting. when i had my old coil on there it would turn over but not start. so i bought a new coil, the one i got unbeknownst to me was considerably bigger than my old on, but i bolted it on anyway and tryed it. my car did the same thing as before but after a while of tinkering and trying to start it, it would start to turn over slower and slower and now it wont turn over at all. my question is, is the bigger coil gonna help me or hurt me? wtf happened to the car to make it turn over slower? ( sorry i know that was a noob question but im a noob when it comes to the electrical part of cars) and what can i do to fix this? i really wanna drive my car. any suggestions would be usefull. sorry for the length of the post, but im starting to get alittle frustrated with this.
Joel

ok, sorry about losing the origonal thread, but just to recap. im not getting spark and i dont know why. i took a volt meter and i have voltage going into my coil but i dont have any coming out. ( on the old coil) so i figured it was my coil. i dont know if this helps or not, if you need any more info let me know. ill tell you what i can.

i havent checked the TFI mod yet, but i will, is there anything else i should check while im at it?