Noobie questions, Please dont laugh. Ignition coil & Spark Plugs

I just recently purchased a 88 coupe, all stock other then a Crane Hi6 ignition. I have always tryed to do my own work on all my vehicles just to learn the tools of the trade and to save money, and to be honest I enjoy doing it. Thats why Im coming to you guys to ask these embarrasing questions. Hopefully you guys wont be too rough on me and laugh me out of the forums

After purchasing this car everything felt great, although it did seem like it was running fairly rich. A few days later after owning the car I started to feel a slight vibration, sort of like a miss. Mind you the car still ran, just felt like it was running on 7 cylinders instead of 8. I went ahead and changed the spark plugs, properly gapped them and popped them in, Although on the passenger side of the block, on the second cylinder, I couldnt get a socket over the plug, by luck I got it out by loosening the header. Putting it back in I could only get the plug finger tight. Will this cause problems???

The old spark plugs were horribly corroded, but after putting in the new plugs the miss is still there.

After doing some research I read quite a bit about ignition modules, and coils. I figure these havnt been replaced either, my only problem is I have no clue where the coil or the module is . I know the coil sends a signal to the distributor to tell it to fire but what does the module do? Is the module the Crane ignition and what does this ignition do, just send a greater signal or increae spark for a better burn? Also, can someone please point me in the right direction on how to replace the coil? I would really appreciatte it. TIA!

Thankyou so much Jaswir! I am suprised to see Ive gotten a responce so soon!

I forgot to mention the stang has GT40P heads from an explorer I think? Anyway I put in Autolite 103's. Is this ok? Also I mentioned I had to finger tighten one of the plugs, yikes, Im hoping its down in the cylinder ok.

Im not too sure where the fuel filter is either. I apologize for these annoying questions. Ive searched but cant find anyone explaining where this stuff is. Ill see if I cant replace the coil tommorow. Thanks a bunch!

Thankyou guys for being so helpful. Ive been posting for days on different sites and could not get even one reply. On this site Ive gotten many replys in just an hour! This site is great!

Ok for replacing the coil and fuel filter, is there any specific brand I should look out for? I read not to buy a coil from autozone. I think I'll go down to Oreilly's and purchase a coil, cap and rotor, and filter from them. Is the replacement fairly straightforward?

I am going to reply to my other thread now. Thanks a bunch guys!