My 2006 Chevy Aveo has been reving up RPM's when starting it and eventually goes back to normal. Recent;y I had issues with it not responding well when taking off from 1st gear and it wanting to stall out. I backed out of the driveway and put in neutral and the RPM's started bouncing up and down.
Spray a carborator cleaner all around the carborator and vacuum hoses. If rpm rise you just sprayed on your vacuum leak.
Find and remove and clean your IAC valve..use MAF cleaner...you need to remove two torque screws..takes 10 minutes...spray the valve to remove all carbon...reinstall and drive car for 10 minutes to adjust..do not run lights, radio or anything else until you return and park..valve had what is called a pintle with spring around it...make sure to spray every part of the pintle and wipe in a straight motion with clean rag...cheers
SOURCE: 1991 c1500 305- engine idles
there are numerous things that could cause this. Something I do on mine every 6000 miles is get a can of carb & coke cleaner. I start the truck, and rev to 3000 rpms then I spary cleaner directly in to the TBI. This cleans pretty much everything out that has been built up over time. (Truck will try to die when performing cleaning. Keep sparying and up the amount of throttle just enough to keep running.) Now since the truck is a few years old I would next CK the vacum lines. They run all over the top of the engine as most people know but also on your truck they are what run the air vents moving from floor to vent to defrost, and if 4x4 the front axel hub locks. There is a vacum line that runs from TBI to the vacum canister (located on driver side behind head light) Then it runs down beside the radiator to the frame rail then down the frame rail to the cab. This line is mostly metal (just like the metal brake lines) and it seems get holes in it from it rubbing all sorts of ****. Then I would ck the throttle postioning senser, and timing. Also on these trucks the idle will be around 200 to 400 rpms higher in Park or Netural then if in Reverse or Drive. If it does not change more then likely you are having either problems with a sensor in the transmission, or Computer problems. Also if you have a TBI spacer it will rasie your idle most the time. If you dont have a spacer you will also want to try this. (you never know if someone else may of adjusted it) You will need to adjust your idle screw. NOTE: Keep track of exactly how much in or out you adjust this screw. This way it can always be returned to stock.)
SOURCE: 1991 Chevy Caprice, V8 5.0L, throttle body
tune up is likely what you need from description
Testimonial: "thanks for replying, thats what I thought too, but I have another question, I just added more comments to the prior comments, please read. thanks again. "
SOURCE: 1991 Chevy Caprice has a mild miss fire and stall
Do you have the idle speed turned up to keep it from dying? Because it is high. Check engine light on? Have you checked for vacuum leaks at the gasket under the throttle body? How does the car run under acceleration? You might have a worn distributor shaft.
Testimonial: "Thank you for your tips and ideas you have gave me, One question, but before read my latest update. my car rpms hover around in between 1100 to 1500rpm at idle, but when I shift into drive it goes to a steady 1000rpm... is that good? if not, what are the correct specs. thanks again"
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Note, check for vacuum leaks with a spray bottle of soapy water...
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