Ok, as stated I have an 1998 Volvo xc/v70. My check engine light is on and pulled the following codes P0171, P0243, and p04550. My car wants to shutoff on me when ever I sit at a stop and I get very sluggish acceleration at stand still. I've checked my volvo manual and it say a loose vaccum hose could cause this ( evap has a gross leak ) I want to perform the pressure test but I have no clue where to apply the pressure. Thanks in advance.