The '88 240 has been occasionally idling high (2000-2500rpm) for no apparent reason. If I shut the engine off when it is idling high, and then try to restart, it will not restart unless I put the accelerator to the floor and hold the starter on for up to a minute. There's a strong smell of raw gas, like flooding, but it does eventually start if I just keep the pedal to the floor and hold the starter on. Someone told me it might be a bad temp sending unit for the fuel injection. I assume this means that it's reading cold, or not reading at all when this happens, and the computer is telling the fuel injection to choke the engine as on a cold day. I've ordered a new sending unit from IPD...$13.95 Does anyone have any experience with this?