i just bought a new hpi rs4-3 & all i have out of it is bad luck. for some reason i can't get the motor tuned right. it takes it over 1/2 a tank of fuel to warm up.i own 4 other cars even a regular rs4.they run fine.now i wanna try a different motor cause this 1 is going in the trash. i wanna try a good .12 since i just installed a 2 sp tranny.so what is a good motor for this car?