Stalls repeatedly on initial start of the day;seems to be better in summer

This is the passcode security system installed at the factory. check your owners manual to reset it. Better yet reset it 3 times to ensure the reset is done. It will take you 30 minutes because you turn the ignition to on, not start, and let it sit for 10 minutes. Turn it off then back on for another 10 minutes and then repeat once more. That fixed the situation for me for awhile. My best advice is to sell the car. This happens repeatedly and no one seems to have a good fix.

Use a bottle of yellow HEET dry gas to remove any moisture problem in the fuel.

Clean / replace air filter.

Top off ATF to MAX level.

Use starting fluid to aid starting.

Have the fault codes read. Replace faulty items. Use only genuine items as non-genuine replacement are not always compatible with the OEM fitted CPU units. Look for position sensor with intermittent fault. Check all wire connectors for loose or dirty.

bring back to mechanic you definitely have some sort of oil pump or internal engine problem

My first guess would be the fuel pump. Alot of defective pumps will operate until they warm up.

you have problem with cooling system could be coolant temp sensor

There are usually three things that cause this problem. Either 1. your car is intermittenly having the power supply to the ignition interrupted, i.e., loose battery cable or ground, or ignition module, etc 2. your alternator is failing intermittenly, or 3. Your fuel pump is going out. The most common is the fuel pump, especially with your symptoms. The way you test, is, when it won't start, shoot a little fuel into the throttle body, and see if it hits and dies, or hits and keeps going, etc. These things are notoriously intermittent, and of course, you can only troubleshoot something when it's currently not working. As for the alternator, you'll usually have some other warning sign, such as a battery light, or failure of instruments, etc. As for the ignition module, it's more of a remote chance that I included as an option. Hope this helps you out.

maybe you need to have dianostics done on the inboard comp

try replacing the throttle position sensor

I had a similar problem, do a compression check you may have a valve problem.