Had my car back from the garage 2day fresh with a fixed head gasket! It was running great been a few miles in it and it seemed fine, mint infact! but, 2nite on my way home the car went lumpy and started 2 run funny i realized I had ran out of petrol (no warning petrol light!!) although I knew i was on the red and I was going 2 fill up at the next station. I filled a jerry can and put in petrol, the car didnt want 2 start at 1st and now even after running it a little while it sounds really lumpy still and im not sure its just the petrol thats the problem any ideas or advice???? please!