hey guys ive had a problem with the car for a while even on both motors ive had in the car, when it rains or i clean the car i get low power and alot of missing at around 15psi, this is an st205. I am thinking mabey the dizzy is getting wet?, and my buddy here also has the same problem.

The UK is pretty wet and this isn't a common problem here

Usual culprits of misfire are ignition related, change/check in this order (imho):

1. Plugs - fit NGK BKR7E for cars upto 400hp
2. Check ignition timing
3. Replace rotor arm
4. Replace dizzy cap
5. Check engine/battery earths
6. Replace ignition leads

If it's a usual problem the above will fix it at your lowest cost

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Kris
95 ST205 - slept for 10 years, now waking up...
Avensis
http://www.gtfours.co.uk
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Turbocharging - the replacement for displacement

sounds good, thanks again

For misfire when wet I would most suspect external ignition components I.e. leads cracked dizzy cap or rotor arm.

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If at first you don't suck seed, try drier grain.