my 2000 gc you can be driving 20,30,60 mph, idling in park, in gear or neutral, it decides to die... been at jeep dealer for three weeks, 2 new key immobilizer 2 sets of keys, ignition switch, pcm, crank and cam sensor and $2200 later still does the same... talk about maaaaad. when it dies it takes 5 10 20 30 minutes to restart. it also when it dies all the guages drop to zero except volt meter goes to 8.5 volts . i've checked grounds, ran wires from pcm to cab kick panels,both sides to bcm back to battery for corrosion, melted, broken down wires and found nothing. checked fuel pump it stops half a second after it dies. anyone please give me input, i'm about to give up on it

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