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Originally Posted by Tigerfan86
The problem with checking is as soon as i crank it up if i let off the gas the engine dies. it will only run if i keep my foot on the throttle..
Could this be something else besides alternator????
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I'm guessing it could possibly be something going on with the throttle body, in older models vehicles the TPS...Throttle Position Sensor is a separate/replaceable part attached to the throttle body and if bad can do what your's is doing plus other issues, but on the 4th Gens 4Runners the TPS is integrated into the throttle body and can't be replaced.
I have never had to test one but here's a link that may help you get started on how to test the sensor to see if it's bad, you may have to do more research to be able to actually test it properly, such as the values mentioned to know if it's within the correct range and the type of sensor it is.
Symptoms of a Bad or Failing Throttle Position Sensor | YourMechanic Advice