My 2000 Chevrolet Tahoe 5.3 L is idling at 1300 rpm when traveling above 15 mph and then it goes down to a normal 600 rpm when it comes to a stop. The only way to tell it is doing this is to put it in

SOURCE: Idle Problem when you slow down of come to a stop idle goes low

THis has happened to me in the past. My fix was to clean the throttle body. The problem began after my battery died. The computer was defaulted back to its original settings after replacing the battery. Once I cleaned the throttle body, everything was fine. This happened at about 85,000 miles.

SOURCE: idle too high on a 06 cobalt

when you clean it make sure that you hold the butterfly open so you can get the spots clean that need it. If there is anything in the way the butterfly will not close. Just a small bit of dirt will do this .

SOURCE: 2004 Tahoe Heater Problem

check coolant level ,must be low ,chck for coolant loss

SOURCE: rough idle

Check or replace the EGR

SOURCE: Oil Pressure Light Comes On after 10 min of Driving

You may not have put the right amount of oil in your car, your oil pressure sensor could be faulty, or you may have a leak.

By revving your engine, you're increasing the pressure and thus turning off the light and making the sensor think that it's at the correct pressure.