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The battery died last week. After I jumped it I noticed the truck would only stay running if I was revving the engine. As soon as I take my foot off the gas rpm drops to 0 and the truck dies.

Because it started happening after the battery I figured the battery must be dying (it is 12 or so years old), but after charging the battery I can start the truck without a jump, but without constantly revving it immediately dies.

I recently replaced the air filter. Something online said maybe the fuel relay, I popped in the spare from the fuse box but with no success.

Any ideas?

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Why did the battery die? Did you leave your lights on overnight? If not, your alternator may be failing. –  vlsd Nov 4 '13 at 21:05
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The lights were left on for 8-9 hours or so, not technically overnight, but the same thing. –  Jack B Nimble Nov 4 '13 at 23:32
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1 Answer

I suspect your alternator or your battery or both are failing. Since your car needs both fuel and spark to keep the engine running it is possible that, unless you're revving up, the fuel pump and all the other electrical components are not getting enough juice to make the grade.

Test the battery and alternator. This post describes the process in great detail http://mechanics.stackexchange.com/a/412/1509

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