Idles rough
Code 32 is the egr system, if you are getting a rough idle then this may be your problem, check the EGR valve, this system has a few parts the valve and the vacuum control solenoid , the valve may be bad or have carbon stuck in pintle or solenoid is bad and allows vacuum to open it at idle when it is not suppose to. try to remove vacuum line and see if idle smooths out if not remove the valve and see if it is open, if it is something you can clean then do so otherwisr replace it and also the solenoid.
when you remove the valve start the engine it will rev high but thats okay, with engine running you will see two ports, one should have vacuum and the other exhaust, make sure they are not plugged, if so unplug them. start with this.
SOURCE: location frame ground wire on chevy caprice 1993 will not keep ru
Check all car's sensors... the air-conditioning sensor has something to do with this
SOURCE: having DTC 0300 intermittant error code with rough
iwould say try some octane booster sounds like poor quality fuel p0300 is a multiple misfire so start with that and i believe vettes are supposed to run 89 or better octane
SOURCE: dtc code p0121 and p2135 2007 chevy malibu
both codes refer to the throttle position sensor, the sensor is at the throttle plate, on the side of the throttle body. to test remove the connector to sensor, use a ohms meter to test. put 1 lead to top connection and the other to the bottom one. move throttle and the needles on the ohms meter should move very even, move throttle slow to get a good reading, needle should move without no hesitation, if the test is bad replace tps sensor. if the sensor gets to bad, it can have an effect on transmission shifting. after fixing sensor have the light turned of with an obd2 scanner.
SOURCE: where is egr valve on 1993 chevy cavalier, have
The 3.1 litre has an electronic EGR valve. It should be on the passenger side towards the firewall. It looks like this...
http://www.autopartswarehouse.com/popup/?type=more&image=L2ltYWdlcy9wcm9kdWN0X2ltYWdlcy9pbWFnZXMvYWNfZGVsY28vYWMyMTQyMTI5LmpwZw==&title=QUMgRGVsY28gRUdSIFZhbHZl&text=QUMgREVMQ08gRUdSIFZBTFZFIC0tIEEgaGlnaCBxdWFsaXR5LCBPRSByZXBsYWNlbWVudCBFR1IgdmFsdmU7IFJlcGxhY2VzIE9FIG51bWJlciAxOTE4NzMxMS4=
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