2003 chevy malibu revs up and down for no reason close to 2500 rpm in idle. once operating temp is reached it shuts off. it can be restarted with no problem at times for a few minutes. Some times it wont stay on for more than a few seconds and the fuel and temp needles wont work, only rpm needle works.
Check the idle air control valve for carbon buildup. Also check for a vacuum leak.
http://ricksfreeautorepairadvice.com/bad-idle-air-control-valve/
High idle rough idle Ricks Free Auto Repair Advice
SOURCE: High Idle and Torque Converter wont lock in all the time
i would check the iac valve on all three of your vehicles and on the ones that are sticking and wont idle down i would also verify that the throttle plate in your throttle body is not hanging up on a bur or something.
SOURCE: '99 chevy Silverado Z71,5.3 engine.....will not rev when hot.....
try replacing your EGR Valve, or your Oxygen Sensor
SOURCE: Fuel Gauge
I believe chevrolet has a recall on this problem having to do with wiring repair at the tank.
SOURCE: 2002 malibu runs hot.
Sounds like you have a faulty head gasket or maybe a cracked head.This can cause overheating and the check engine light to come on.The code for the o2 sensor is probably caused by coolant getting into the exhaust system and coating the sensor.The coolant fan may work but it cannot remove enough heat from the rad to make the engine cool off.Try some engine coolant stop leak to see if it will help.This maybe only a temperary fix.Let me know if you need more.MOE
SOURCE: Fuel gauge needle way past full,
Most likely this is the common 03-05 Cavalier instrument cluster problem where the stepper motors on the cluster's circuit board go out. It can be fixed, check this page for more on how to get it taken care of - Cavalier fuel gauge broken
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no codes. after it stalls throws tps code and evap emissions codes. tps was replaced but will still show code after it stalls
i thought about egr or oxy sensor. but i have never had a car which would loose power to half of the cluster because of an egr or oxygen sensor problem.
fuel pressure is at 55 psi
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