Quick question..bought my first g about 3 weeks ago..at a stop light sometimes the rpms fluctuate i think between 6 and 900 maybe..and my coolant leaking out of the reservoir i gotta add a little bit every few days..no the oils not frothy no white exhaust no sweet smell no bubbles on the dipstick..what could be causing the rims to be jumpy?? And how do I find my coolant leak..mechanic hooked it up to a pressure tester and he said he thinks it's coming from the radiator hose?