Hi there peeps i have a golf gti 8v mk2 that i uswe as a family car and keep my other tucked away

heres goes the problem is when i drive along the road after say 30mins the car will cut out and not start for a wee while

so i thought it was the fueling side but it turns out to be it stops sparking

but if i leave the car for say a few hours or over night it will start first time :S really puzzeled and want to set it on fire lol but nead it for family purposes i bought the car as i am doing a full rebuilt and paint on my toy and wanted to take my to for it to be perfect so can anyone please please help me as i need this car for daily use thanks for taking time to read this
cheeRS
Craig