cant seem to keep oil in it, it sputters real bad from 11-23 mph. it was between 14-19 but seems a bit worse now. running in that range for maybe 3 mins and my temp light will come on. i dont think it the jetting cause with stock intake its still doin it. also it was ran hard for prob 4 days before i found out it had no oil in it.... also when i changed the oil there was some white stuff on the dipstick.. coolant? it had also died underwater once and ive heard that can cause a milky look. any thoughts on prob and how to fix it?