wut should my ccar be idling at it idles at like 500rpm is that 2 low i always think its going to stall if thats 2 low how to do i change it. next problem i just got my car back from the shop they put a new intake manifold on and the throttle return spring is kinda weak should i find a new 1 or just but a second 1 on it. temp gauge it does work how do i figure out wuts wrong wut do i need to do to fix it. and the gas gauges is like 1/8 off it says i have some gas left but i dont?