Two issues with my car at the moment, any ideas :

- My s2 is a pig to start from cold. If you turn the key over and try to give it some gas it just kinda chugs and keeps turning over.
However if you turn it over it will eventually start up itself i.e you can't put your foot on the accelerator to give it some gas from cold or it cuts out like its suffocating itself or something like that.
Once its warm its fine, it will start on flick of key pretty much all day long


- when driving and getting into boost from around 3k. it starts hesitating like its hit a flat brick wall or something. You get a juddering and shuddering sensaion like it wants to go and pull but somethings restricting it. The exhaust makes all the right sounds aswell as if its building power and gets louder but it just hits a flat spot and hesitates to pull in progression.

I also noticed yesterday i was trying to put my foot down in 2nd gear and took the revs right to redline and it cut out and the dump valve went off, but my foot was still on the accelerator pedal pushed to the floor, i hadn't even let off the throttle for the dumpvalve to come in.

Any ideas?

standard engine stage 1 spec car. standard cooler etc. only running 12psi or so