Will not stay running if started after has engine warmed up

This sounds like a crank sensor issue but could be a number of other things.

Here is a guide that covers the symptoms of a crank sensor:

https://www.2carpros.com/articles/symptoms-of-a-bad-crankshaft-sensor

Here is a guide that will talk in more detail about the common issue:

https://www.2carpros.com/articles/stall-at-idle

After you read through this information let me know if it matches what you are experiencing. If so, let's go ahead and check for codes and if there are no codes we can start with the attached info and then if nothing else, I would just replace the crank sensor and retest.

Let me know if you have questions. Thanks

appreciate the information my car has low km with a lot of money sunk in beyond value. However, i am keeping it and it works for me.

Understood. I have been there. Clearly there is a point when we need to draw the line but if it is running and you like it then it is worth it. Thanks

Thanks. Just today my car started reviving up and down like searches for stable idle. Throttle body maybe. Vacuum lines brand new and timing is bang on. i use premium gas.

Yes. This could be a throttle body but more then likely it is something that the ECM is not expecting like a vacuum leak. That is good that all the lines are new but we need to check for a vacuum leak in the intake and around all the hoses. Use this guide to help do that:

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

If that checks out then here is some information from the manual that covers rough idle. We need to check this out as well.

Let me know what you find or if you have questions. Thanks