hello,definatley replace the ovp,its located behind the black plastic shield,located behind your battery,the cold start injector could be an issue,but most likley you may want to check the eha,its located on the back of the throttle body its a black square sensor with a 2 prong plug facing passengers fender,these go bad and cause cold start issues,its $250.00 new $40.$60.00 on ebay,if its defective you will want to replace it and have the air fuel ratio adjusted.,most common diag for a defective eha is a strong smell of fuel when starting,and hard cold starting,with ruff almost stalling idle,after 20-30 second the idle will level out.good luck.