hey, i was drivin my 2.0 fiesta si today when the sump bolt came out!!! which i was un aware of as i was driving. when i came up to a roundabout and pushed the clutch down it stalled (i didnt realise the oil till a minute later when i was parking) could this be ive lost the oil so the tappets have built up air in them as it no longer runs on tickover? but is fine when i rev it?? its louder now when i rev it (not realli loud though) any help much appreciated, cheers guys