my car cut out whilst driving an wouldnt start again help please

My Lil micra was driving fine all week then last nyt out of no where had a really bad miss fire so i stoped made sure all my ht leads was ok as i jus made my own copper core leads an made sure they was in the spark plug and dizzy cap properly, started her up an she ran fine for 20 mins then the engine cut out, it wouldn't start on the key and when i bump started it it would run but had no throttle, i had spark and fuel being supplied but she still wouldn't start, i had a look at the fuse box inside the car and pulled the starter signal fuse out (7.5 amp) that was fine so i put it back in then she started on the key an run fine ever since.

any one else had this problem ? Or know what caused it ?

many thanks