Hey i just purchased a volvo 850 turbo 1994 & i like the car man i feel in love with like a fat kid loves cake. But anyways ive been having some problems lately with it & like one of my big worries is when ever i turn the car on in the morning & put it on drive an arrow flashing comes up is if i had it all the way down or on winter mode .. But its on drive ... I press the gas & i would just rev & move foward slowly i would have to turn the car off turn it back on & leave it sit till the motor gets hot & then put it on D and go about my day. I checkd the codes on the car & it has gave me some codes.
143 Front knock sensor signal

232 Long term fuel trim, idling

315 EVAP system

414 Boost pressure regulation

433 Rear knock sensor signal

435 Front HO2S slow response
Thats on the SLOT A2 . I just wanna kno which one should i really worry about & get it fixed right away or how can i fix it if its possible to do it my self . I really wanna keep the volvo man i like it for my first car.. I appreciate for ya time !!