been having problems with my mk3 8v (agg) when cold when i go to stop at say a junction ect the revs drop to about 2 maybe 3hundred and she stalks, scary as hell as i have to cross 4 lanes of traffic in the morning. but noticed oil light flashes at me once stalled. i thought it normally stays on as well as the battery light? leads,plugs,dizzy arm and cap, battery are all new and throttle body and air intake are spotless. any help please guys??