Just read that your capable of doing suspension rebuilds.Right then.......your capable of doing this also to fix your misfire problems. Your wiring for the coils is most likely cracked and arcing all over the place. Take the lid of and show us a close up pic,only 3 x allen bolts. If it's cracked, you need a new loom. So you might as well approach Alex on here (error404) and S2 forum for one of his new looms and then buy the modern coils he recommends.All this is very easy to do and needs no specialist knowledge. This should be your first port of call. I'm assuming your car is producing good pressure on all cylinders.What's the mileage?
Ps,you mention misfiring.I take it it's running on all 5 cylinders?? The other fairly common fault is it runs on 4 because the POS (power output stages) is playing up. This is also a very easily replaced part. Plus gaps are also vital to ensuring a clean burn and if they're too big this can also produce misfires. I could check for you later the plug gaps but have to dash. HTH.
