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Re: 1997 jeep grand cherokee starts but wont idle on its...
It sounds as if you have a vacuum leak. It could be at the hose for the power brakes, pcv valve or the EGR Valve hose leaking. You may also have a bad fuel pressure regulator. Let me know if I can be of further assistance.
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The idle relearn needs reset. Keep your foot on the gas at about 900 rpm. Make it idle for about 5-6 minutes. Slowly ease up on the gas until it will idle on it's own, it might take a while. After you get it to idle, it might be idling real low, but on its own, Let it sit and idle until for 20 minutes. After that it should be back to normal. You will have to do this every time you have the battery unhooked for a while.
A slight hesitation after engine shut off due to engine running rich meaning not meeting golden air:gas ratio of 14.6:1 so fuel residue in chamber continue to burn for the last moment.
The same rich fuel problem that was why you had to let gas off during acceleration.
Check out the O2 sensor
Check out MAP sensor