323f sport misfire

hi all just been told about this forum and thought i'd give it a try,I've got a prob and the local garage can't help:
A few months ago my mazda 323f sport '03 started to misfire around the same time when the uk had a fuel additive scare from the supermarket fillin stations ( i think this might only be coincedense--not sure ) anyway i have since tried to fix it myself,i have tried new sparks,oil filter,oil,air filter,sparying carb cleaner into the air/carb tube and even cleaned out the petrol filter but with no joy SO i took it to a local garage and they put it on a dianostic machine but with no luck,they did'nt charge me ( good garage ) but they were not able to help thus tellin me about this forum,Can any one help me before the last step of changing the cat £££'s or more,thanks snappy
ps my ht leads also look fine as i've had a shock from all of them lol.


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tester

have you checked the coil packs yet?

not yet! how easy is it to locate and test.
 thanks for reply

hey there, so i own a 626 and the idle was going up and down and the whole nine yards , to the point of losing all power to the car,took it home on my dads tadom and sat over night , next day a buddy and i took apart the the end of the cable (negative ) to find it was all rusted out , cleaned it all up and now she runs like a charmlol but anyways , hope that helps  and if not , chech all ur fuses.
talk at ya later,
jerami

Hi! Welcome to the site...I'm a newbie here as well and enjoying!