Hello i have a 02 2500 hd silverado when you first start it in the morning the idle jumps from normal then down back up to normal then down when it warmes out it it fine their are no check engine lights but i know it is a sensor but which one
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Cheque for disconnected vacuum hoses. sometimes this happen after working around the engine, if everything looks good, start the engine press down the accelerator pedal keep the engine running about 2500 rpm for 3 minutes then let the engine idle, if the engine idle this means you need a new idle speed control motor, if the engine still dies most probable the fuel pump it's going out if you have a code reader it's possible you have some codes and this can give a good direction
This idle condition is normal for a cold start, the computer is controlling the idle for proper fuel burn. It is not necessary to wait five minutes for the idle to come down. Allow about one minute before putting into gear and driving.
Maybe more info would be helpful, like gas, diesel, engine size, trans, cold, hot, morning first start,idle, driving down the road, accellerating?, coasting????????what you have checked and your results of those checks. Check eng light on? if so, codes?
This is going to sound crazy but i had the same problem with my 2003 silverado, changed the plugs, battery, and alternator with no sucess at all. Finally took my truck to a well respected auto repair shop locally in my area and they suggested i change the fuel filter under the truck. Crazy right? Why not, so i did and my truck ran perfect after i changed it. Shop tech said my truck was starving for fuel which in turn was not letting the alternator spin above the correct RPMs at all times which in turn caused the electrical computer system to not operate correctly. If you tried everything might as well try the fuel filter before you have to spend big bucks at the repair shop. Hope this helps.