renault laguna engine fault?

i've got a renault laguna 1.6 16v. 2001 (51 reg) 36,000 miles.the fault is=when i put in my key card, dash lights come on as normal (oil battery etc)but the electrical fault light stays on.I start the car and the rev's flicker fast between 1000-2000rpm the engine will not respond to pressing the throttle,could anyone solve this problem for me as it's becoming a pain.Any help please!!!!