1997 Ford F-150 Q&A

1997 Ford F-150 Question: idle problems

i have a 1997 ford f-150 v6 4.2 and the problem i am having is when it idles it jumps between 500 and 700 rpm and acts like it wants to shut off and when its in gear at a red light it does the same and then i push my gas to go and it almost stalls out on me but when i get going it runs good. why would it be doing that -
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