Has this started when the temp began dropping really low?, I always had issues with my beater, it never ran smooth. Well now that it hit -20 to -30 here in montreal my engine sputters like mad bellow 3k rpm. It will idle maybe for the first 30 seconds then it begins to idle around 400 and eventually will stall unless I keep it reving around 3k and up. I read up on this forum that this symptom can be from a broken temp sensor. I will be chaning my sensor hopefully tomorrow.