it flashed at around 75mph. i changed the rotor button and the distributor cap. now it only does it at around 85 mph
the check engine light flases 23 times at high speeds. what does this mean? on 2001 GMC Sierra 1500
Code 23 is Manifold Air temperature sensor which is part of the airflow meter in your truck. Autozone have some popular workshop manuals for free on line once you register (for free) on their website http://bit.ly/autozone_repair_info. There is a company that independent auto repair shops get their information from, this same information is available inexpensively for people that work on their own cars.. The information is year make and model specific, covering repair procedures, torque specifications, fluid capacities and specifications, service bulletins, component locations, wiring diagrams ect.... Alldata is very easy to navigate http://bit.ly/AllData_Repair_Manuals_Online
it means your car has the obd2 trouble code, check out the code.