Help.. maybe..

[stiddy]

hey all..

M car has been running a little bit rough lately.. actually very rough.. What i thought was a bad batch of fuel is starting to prove very costly.
It wont rev past about 4500 and if it does it coughs and backfires and carries on.. sometimes even makes a popping noise out the airbox.....
if i suddenly step on it, it will cough, drop power for about a second then pick up, rev out to about 4000rpm and cough and splutter and miss and carry on again.. no happy with it. Sometimes it will do it all through the rev range and sometimes it wont do it at all and wont miss a beat.
Ive changed the spark plugs $133, plug leads $190, fuel filter $15, injector cleaner $20 and alot of time cleaning the fuel system.

Ive come to the conclusion that its the coil packs.. when they get hot, or something they start to play up..

SO can anyone tell me where can i get some aftermarket high-performance coil packs and price that will bolt into the stock location?? :

Thanks,
stidds