hello i have an 1992 volvo131aq today i was out on the lake everything going good i started to slow down bellow 3000rpm and it started to chugg and jerk not to bad but then my tachometer started to bounce but engine rpms stayed the same then the engine cut out stalled i waited 10mins and kept going full tilt to harbour whould this be an electrical problem???what would cause it to stall??? 