If running mutiple errands and the car has been startet and stopped after a few times when trying to start the engine the wont stay running.

Does the key feel loose in the barrel? Could be a sign of a dodgy ignition switch

First you must determine if the fuel is stopping or the spark is stopping..If the fuel is stopping this could be a computer problem.. If the spark is stopping then it could be the IGN Module in the distributer. or any nomber of sensors. Squirt a little fuel directly into the Throttle body on the intake manifold.. If the truck runs longer its probably loss of fuel.. Do this several times to make sure, be careful and only use a small amounty of fuel.. you do not want a fire.. RE: Spark: Take a plug wire and an old plug..put the wire on the plug.. hold the plug against a good ground .. have someone crank the engine .. does the plug stop firing? The engine dies.. and will not restart for a minuet or so.. during this "no start" time do the plug test. If the plug will not fire during this time take the module out and take it to Orillys Auto parts.. They can test it.. really expensive part. Don't replace until you know it is BAD..

check fuel pressure possible fuel pump issue

have a pressure test done on the fuel manifold to check for pump-regulator pressure and filter performance. You state that the filter was last changed in 2007 so it is well past it's blocked up date .. Run fault codes . replace the canister . Have a compression test done as the engine is getting long in the tooth and may need refreshing .. Check that the cat converter is still operational as they will block up the exhaust system and cause poor performance

have vehicle scanned most auto stores offer this service for free the code will help with diagnosing the problem

Have you checked the timing belt?

spider injectior supply fuel to the cylinder when they go bad thats how they act hope

try resetting the alarm system first.if you dont have the book,leave feedback.

I doubt it is the ECM, that doesn't really make any sense to me. I believe your fuel pump is the issue. What do you mean it isn't on under these conditions? When you do a long errand it start and is fine, right? It is heating up during your drive, then won't start up after your short errand. That's why I ask if a longer errand would be fine, and obviously in cold weather, this would be the same. A longer errand lets it cool down.

Does the engine crank and turn over easily when it is hot? If not, it could just be the battery, but I kind of doubt it. Also, you are using premium 92 octane gas right? That care needs it.

Lastly, if you give it some gas before you start and while you start it, you may get it started. I'd hit the pedal a few times before starting and definitely hit the gas when you start it.

It's not the ECM; I would be shocked.

Good luck!!
EJ Kudelka

the throttle position sensor can cause it to do that