Engine dies when throttle let go.

[99XXXJ]

My jeep currently needs to be jumped. Once it starts i can only keep it running by keeping the throttle down. Also, while driving i noticed that the battery gauge on the dash is pinned at the "14" mark and it shorts out killing all electrical for a split second. Alternator/battery?? Please help.

[fredjacksonsan]

What year, engine, and miles?

My Jeep runs at about 14 volts also, and is fine.

1st thing, have your battery checked. A bad battery can cause the issue you are having.

Next, check the alternator output. (Both of these can be done at your local auto parts store, usually for free)

Last, and this is what gets some people, is corrosion inside your positive battery cable. This can reduce the flow of electricity and cause the issues you're seeing. Just cut and peel the insulation back about 3-4" and if you see any deposits, replace the cable.

Let us know what you find after checking these.

[99XXXJ]

99 4.0l, just went over 150,000 miles.
Optima red top
can't really get it to the parts store right now. I am about to just fork over the cash and get a new alt n e ways. Not sure if the previous owner ever changed it.
Thanks dude.