thinking about buying a s1 rst, its been rebuilt with a 1900 arp bottom end, been converted to run efi, it needs a little help to idle from cold, need to keep foot slittly on accelerator but when the car is warm it runs as it should and idles no problem any ideas on what this could be and how to fix it and most important how much it gona cost me lol, any help would be good cheers

 

I'd get a fuelling check done first, if it's running slightly lean then tweaking the mix will sort this issue and the cold idle.
Don't know what ecu you have but hopefully it's adjustable cheaply.
tabetha

 

ok cheers mate anyone know where the best place to take this to get it checked in the south east, kent, essex

 

I don't know your area well, but even a MOT garage can check the CO, but for safetys sake I'd get a full rolling road fuelling check done, can save a melted engine if mixture very out.
The nearest I can think of to you is TOTD, that I'd trust, torque of the devil, ask for chris.
tabetha