What is the malfunction when the light flashes that the car is in engine failsafe mode and the car starts to decelerate though the accelerator is still in operation?

Answer 1

I have had this problem on my jaguar s-type, once finally properly diagnosed (after about a thousand dollars two dealers and a specialist)it was nailed down to the fuel filters being dirty. Most cases the filter will pull trash from the bottom of the gas tank and clog up. Though the vehicle will perform normally at startup, performace will decrease as you drive and the fuel filter will become saturated with to much gas because of the dirt clog. This will cause the car to decelerate and stall even though your pressing the gas peddle. Buy a fuel filter for $15 and it will run fine.