I have an 02 HD, when i start the truck up it does not want to idle and will sometimes die, i got it started but it had a very weak idle. It is the stock intake. i unplugged the idle sensor while it was running and plugged it back in and the idle went back up to the normal rpm level. i think the sensor is bad or going bad. sometimes it starts fine and sometimes i have to put the pedal to the floor when starting hoping the idle will be normal. any ideas on what it could be. thanks.