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If everything was ok before you left your lights on then the battery needs a full charge! The battery will not receive a full charge by idling, to charge the battery you need to take it on a long run in top gear such as a motorway for about 15 to 30 minutes!
Remove the air intake hose at the throttle body, clean the carbon out of the inside using a brush and a can of throttle body cleaner, do this with the battery disconnected after cleaning drive the truck for about 15 minutes and the idle should be back to normal.
Yes I went nuts with the dead battery problem till I found TSB_EL015-03. Seems the frist half of the production year 2003 Tundra has a problem with the tow package relay being left energized if you leave the lights in the daytime running position so that they turn off by opening the door, it will run the battery down. Toyota knows this, won't do a recall, but there is a kit you can get that is listed in the Technical Service Bulletin EL015-3. When it tell you to use a special tool to remove a pin from the large connector (red) don't bother, you will never get it out. Just cut the red wire and use a crimp tool to splice it to the kit's wire. There is no room to work it, just cut it and splice it. http://www.toyotanation.com/forum/123-truck-archive/74107-2003-battery-draining.html
probly need a tuneup-change plug wires and distributer cap--------clean throttle body and idle control motor---------get a scan and data stream done as an option
sounds like a bad idle control sensor.as long as you're driving it and giving it gas it runs somewhat ok right? it won't idle by itself,or it idles up and down by itself and then dies?thats a sign of a bad idle control sensor,some times they straighten up after the engine warms up and run fine.but eventually go completely bad and won't idle at all. hope this helps and thank you for choosing fixya.com
Turning over is what the starter does to the engine ...you can turn an engine over with no spark plugs in it...but you can't start it. Turning over is cranking .....the starter turns (cranks) the engine over (comes from when you had to put a crank in the front of the engine and crank it.) Does it crank normally but has trouble starting???????
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