Renault clio 1.2 starts up but cuts out if no acceleration can be driven but cuts out?

my renault clio 51 plate 1.2 is having running problems.it was running ok ,and the engine management light was going off and on for a few weeks but it cut out at junctions but when it was driving didnt cut out .then it stopped doing it for a few weeks and was running ok ,until the other day when i checked the oil it was empty so i put some in straight away as i didnt know how long it had been with no oil,the next day i drove a 30 mile journey with no problems,then the next day when i started it up it run for about 15 seconds then cut out ,i tried to drive it but when i got a few yards around 10 it cut out on me and felt quite rough to drive ,then when i opened the bonnet i could hear a noise which sounded like it was coming from the engine only way to describe it was like tapping a spanner onto metal but not excesivley loud does anyone know what it could be as i dont want to be ripped off from a garage ,i did get the aa out and their diagnostic test showed nothing but when i had one previous to this problem e few things come up but i dont know what they were the aa man said that it had been cleared whatever that means any help would be good thx also their is a slight burning of oil or fuel smell