The motor comes with a p3 glow plug, the problem is I had to get a p6 because the great people at the LHS told me they don't make a p3, even after I argued with them and had them take a new engine out of the box to prove them wrong, they saw it was a p3 and still told me that they could not get them, O.S. only supplies them with new motors? Well even after I retuned my motor the thing still will not idel. It is running around 230-240 deg. but if it sits for more than a couple of seconds it loads up and dies . I am running 20% fuel. Also if I switch to 30% do I need to add the shim that came with the motor. Could some one explain what exactly the glow plug does after the engine is up to temp. I am lost. Oh ya I have the 2050 pipe also. Oh ya, I live in Minnesota and this happened in the summer as well as last Wed. at a indoor track. I am not running it in the snow or out in the cold if that makes a differance or not.