Hi. Can anyone help solve a problem i'm having with my Renault Megan at the mo... I'll be driving along, when suddenly it feels like somethings jamed & has no power.It makes a dreadful noise which sounds like its coming from the engine. I can have my foot to the floor & have to be in a lower gear, but there is little responce & as suddenly as it jams, it will clear itself jerking you forward. I put injecter fluid cleaner in with the petrol & this seemed to help for a while, but doesn't seem to be effective anymore.Hope someone can advise me. Victoria