Will start right up in the morning, but after 4-6 times of parking and driving it will hesitate to start up again. Wait awhile (10-20 minutes) and it will start up again. Has 105,000 miles. Time for tune-up?, starter?, bad gas? Any suggestions are appreciated.
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This is likely a problem with the Mass Airflow sensor, it is a sensor that reads the amount of air going into the engine, when it fails it causes severs hesitation and power loss. Contact a local parts store or your GM dealer for a rebuilt one, the part is about $150.00. It is locate in the air intake hose to the engine.
This is a very difficult one to pinpoint. The actual plug on the crank sensor could be shorted,The ignition module located under the under coil packs have shorted in some cases I have seen and do what you are saying.There are extensive testing procedures for testing everything from ECM to cam sensor.could possibly as simple as a ground short.I am sorry I cant give you a better diagnosis but suggestyou have someone with experience in wiring trouble shooting.
With everything you have done the only thing left is the MAF or Map sensor . This is what tells the computer the altitude and air density to know how to deliver fuel.. If its lying to the computer you will have drivability problems. A scanner will show this data.
Yes Is Looks Harder than It Is Just Remove the Pretty Cover from it and Theres An Ordanary Engine Under there Normal Procedure. Dont Forget To GAP The Plugs Correctly Enjoy!! Please DONT Forget To Rate me too Thank You !