I have a 95 940 Turbo wagon that has given me intermittent problems with stalling. When it stalls and restarts the check engine light is on and a code 144 shows up. If I reset the light sometimes I may drive the car 2-3 months without it stalling again. I did notice before the problem started that the exhaust smelled like it was burning a little rich. where should I start in checking for this code 144. The car has 160k and seems to run fine otherwise,no surging and starts fine. HELP.