the other day i got in my car, turned it on, but it wouldnt idle, it would rev automatically to 2k then just drop. It would only go if i pressed accelerator a tad. Managed to get it going and i noticed petrol gauge was nearly empty, it was half way through the reserve, it was running rough and i limped into petrol station, but £15 of brand new juice and been fine since. check that you got enough petrol, and even consider a fuel filter change.