MY F-250 SUPER DUTY 2000 MODEL NORMALLY STARTS UP FINE,BUT IF I DONT LET IT WARM UP 15 MINS. IT WILL STALL AND AFTER CRANKING AND PUMPING THE PEDEL IT WILL RESTART BUT UNLESS YOU LET IT WARM UP ,WILL STALL AGAIN .ONLY RUNS GOOD AFTER THE ENGINE IS WARM.TODAY IT WOULD NOT STAY RUNNING FOR MORE...