Not to long ago someone gave me a 1996 850. It was ragged out, teenagers drove it for a few years. It had the usual problems, smoked a bit, lost coolant and burned a little oil. Transmission slips a bit when taking off. anyway yesterday it refused to start. Turns over and chugs but no go. Anyone have a clue where I should start looking? I do all of my own stuff on my other cars, american made older models, change plugs, coil packs, etc but have never owned a volvo and don' know where to start.