I have 1994 camry 2.2 engine when car warms up engine shuts off and wont start let it sit for about 20min and will restart runs great when cold could this be ignition coil inside distributor

Its a hot start issue.

Can be related to low fuel pressure or problem with crank sensor.

Also it can be weak battery or starter.

But possibilities are to be inspected to confirm what exactly it is.------

To troubleshoot and confirm the issue,i suggest you refer few solved help links with similar types of problem like yours:------

Click the link below:------

1991 Toyota Trecel: Engine Starts fine but dies when gets Warm?

http://whatisbyme.blogspot.in/2012/05/1991-toyota-trecel-engine-starts-fine.html

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1994 Toyota Pickup: Starts fine but dies in few seconds?

http://howtobyme.blogspot.in/2012/05/1994-toyota-pickup-starts-fine-but-dies.html

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1995 Lexus LS400: Running Hot?

http://whatisbyme.blogspot.in/2012/05/1995-lexus-ls400-running-hot.html

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2002 Toyota Camry: Puff of Blue or White Smoke while Starting?

http://whatisbyme.blogspot.in/2012/05/2002-toyota-camry-puff-of-blue-or-white.html

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Multiple problems on car: Car runs hot, A/C blows hot and car starts surging?

http://schematicsdiagram.blogspot.in/2012/04/multiple-problems-on-car-car-runs-hotac.html

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Delay starting on Toyota Prius?

http://schematicsdiagram.blogspot.in/2012/02/delay-starting-on-toyota-prius.html

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Honda car will not start intermittently?

http://technoanswers.blogspot.in/2012/02/honda-car-will-not-start-intermittently.html

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Vehicle Starts, Runs and Loses Power

http://whoisbyme.blogspot.in/2012/07/vehicle-startsruns-and-loses-power.html

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Intermittent starting issues on Volvo 760?

http://schematicsdiagram.blogspot.in/2012/02/intermittent-starting-issues-on-volvo.html

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Car starts and cuts off immediately?

http://repairhelpcenter.blogspot.com/2012/01/car-starts-and-cuts-off-immediately.html

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Car won't start when cold?

http://schematicsdiagram.blogspot.com/2011/12/car-wont-start-when-cold.html

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These details will help.

Thanks.

Head gasket is leaking antifreeze into the cylinders but it is very minor now, soon you wont be able to drive.

a bad engine coolant temperature sensor will cause cold no start conditions.your coolant sensor main sensor during cold start condition because when engine coolant cold PCM will cause rich fuel mixture for cold start up when engine coolant and oxygen sensor warms up cause engine goo in close loop lean mixture.but coolant sensor is the main information sensor if bad it will cause many problems.

I think the engine coolant temp sensor or coolant thermostat has failed.

The only way to answer that question is to have gauges connected to the A/C system and observe several operational attributes of the A/C system when it quits cooling. I have seen weak compressor clutches just stop working (slipping) then when you shut the engine off and restart it, they start working again (for a while). On Toyota's it is also common for the expansion valves to stick wide open and cause the system to quit cooling. This can sometimes also start working again after shutting the system down and letting it sit for a period of time. This condition can be verified by looking at the pressure readings when it happens. I have seen Radiator and/or A/C condensor fans that work when they want to and not work other times - this will cause the A/C to stop cooling. The engine running a little hot can also be a clue for this if your Camry is equipped with a temperature gauge. Again, one of the the best ways to begin diagnosis for this is to simply observe these things (visually) to get an idea of what is going on.

Your fuel pump relay is going out. Replace it and this should fix the problem.

have your idle control switch check, easy and inexpensive to replace. The idle control switch is what keep the engine stay idle. also have your throttle body clean by a professional having that many miles, it will give you better gas mileage.

My starter tested great in several shops also but a friend of mine said my starter is an original part and would be the "weakest link" in trying to correct the problem of turning over. No one had a solution so I got a new starter and WOW it works perfectly every morning, etc!

Most likely air flow metre. Had same problem analysed and replaced and runs perfectly. Not cheap!

I need to get a clear mental picture of what exactly is happening.

With this said, you stated that the car "runs fine" until warmed up.

Q: When you start the car when cold it idles fine?
Q: If you allow the car to idle until "fully" warmed does the car stall?
Q: As the car begins to warm up, Does the RPM fluctuate abnormally?
Q: Does the car Only stall when you press on the gas pedal or does it stall just sitting and idling in addition to pressing the gas pedal?
Q: If you can drive it while cold does the car stall during acceleration when warm or only at Stop Signs / Lights?
Q: If you wait 20min or so, can you start the car again?
Q: How many miles are on the car?