Hi, I recentley got my drivers license and bought my dream car. A Jaguar S-Type 2001. Im really happy about it and it is awesome, but it started being weird since a couple days back. When Im driving it works perfect but when i stop at a red light for about 20-30 seconds the engine dies, and also when im standing stil the engine acts a little weird, it doesnt stay at about 500rpm it kind of jumps between 100-1000 rpm and keeps doing that then shuts off. I have tried puting in something called "K-sprit" which is suppose to stop condensation in the engine (cause the guy who sold me the car told me that i should put that in the tank cause the car had been standing stil for a long time and I live in sweden which is cold and moist). Ive driven the car 105mph (170KM/h) on the highway and no problem there, it just seems to be weird when not driving fast.
Also some info about the car;
S-type 2001 V6 3,0 and gone 173500KM (about 107808) miles. And its automatic transmission with manuel 2,3,4 on the other side and has the sport button.