I was wondering what could cause the coolant to overflow into the coolant res.? The temp is reading normal, a bit below have way. I get stuck in traffic and everything and the temp doesn't move. After I cool the car down, i can pour some coolant back into the radiator, same amount that flows into the res. Another thing was what can cause a misfire? Got cel 71. Running too rich? Thanks. It's a 98 GSR.