i love my 850, but its giving me so much headache last days!
milege droped to 15. it won't stall at all if i not move it, than if i go on ahighway it would stall in 20-30 minutes and no spark after that until it cools off. its hard to belive that something wrong with a spark plugs, rotor or that kind of stuff. the only one thing i can think about right now is the injector which gives signal to computer to turn off the spark. my codes say missfire in more than one celinder. so ithink that when i run it on a highway the fuel would not burn off completly and its somehow turns off the spark.
WOULD BE DEFFINITELY APPRECIATED if someone cangive an idea whats wrong with it and what tostart looking for first?
thank you for your cooperation!

 

Maybe cam sensor or crank sensor.

 

thanks for thereply.
would thecamsensor or cranksensor make my gas mileage go down?
thanks again.

 

No that is usually something else that causes that.
Tune up
O2 sensor
Mass flow sensor