Q: What could be wrong with my vehicle? It stalled on the highway.

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So I'm driving on the expressway and my vehicle just stops we replaced the battery and the alternator . the check engine light has been on for a while . a few weeks ago it was idling rough and not acting right like it didn't want to start. like it didn't want to run but then all the sudden it started acting fine again any other ideas on what it could be or what else we could check

My car has 150000 miles.
My car has an automatic transmission.

Hi, first task is to check for the problem codes that are setting the Check Engine Light. Since you have a "hard stop" failure, this become even more important.

First level isolation is to see if you have spark, or if this is a fuel issue. If you have spark, does it start briefly by spritzing a bit of starter fluid into the air cleaner when trying to start it.

If no spark, check fuse for ignition, then "walk the electrical power path" from the ignition switch to the coil, ignition module, ignition pickup in the distributor - components that would affect all cylinders at once. If it’s fuel - check fuel pump fuse, relay, and listen for the pump running when you attempt to start it.

To avoid any unnecessary repairs, I would recommend having a no start inspection completed by a mobile, professional mechanic, such as one from YourMechanic, who can come to where the truck is located to diagnose this problem, get an accurate assessment of damage and cost estimate for repairs.

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