Ok so here goes. Just bought the supra with supposed BHG, not seing any signs of that right now but cant verify as to the car wont stay runnin. I checked for codes and got code 13 or possible 31? I have checked the firing order, timing belt, cps timing marks multiple times. The only way to keep the car somewhat alive is by holding wot, but then it still only runs at about 1000 rpm? I have not checked or reset the the cps airgap yet. I have a new head gasket on the way so i am still doing that but would like to make sure the car is going to run after. BTW i have no real common signs of BHG, no milky oil, or coolant, do have excessive psi build up in radiator when it will idle. Any and all help would be greatly appreciated. I am mechanically inclined but new to the supra world. Thanks guys