Hello Everyone:
I have a 97 TJ and 95% of the time it idles perfectly. However, about
5% of the time, usually when the vehicle has been run for more than 20 minutes or so, the idle in neutral or park will shoot up to between 1200 and 1500 RPM. The only way to get it to stop is to put the vehicle into gear or to restart the car. If I restart it, it will not happen for a while, but it eventually comes back. The TPS was recently replaced, and I just replaced the idle air control valve, thinking this may have been the problem, but it still has the same effect. I'm thinking now that it may be the coolant temperature sensor (something wacky when the engine is hotter making the vehicle run at higher speeds??). Any suggestions? I'm hoping its not my computer...