I have a 98 jeep Cherokee, I just replaced the alternator and the battery last week. Just today I start my car and it cranks but it doesn't stay on unless I push on the gas, but as soon as I take my foot off the gas pedal my car shuts off...any suggestions

 

No fuel at idle. Replace the fuel filter it could be clogged up. My best simple guess

 

when mine did that it was the upstream 02 sensor

 

Thanks for the help, I took it to the mechanic because I wasn't sure but it was the idle air control value