Well there are several areas to look at .#1 This engine has a crank shaft sensor which is located in the transmission bell housing on drivers side it could intermittently shorting out #2 exhaust restriction. Crawl underneath and with a rubber mallet tap the exhaust and listen for pieces rattling around that can intermittently plug it up. The check engine light only gives codes to current conditions that fall out of specs.
Sounds like a failing fuel pump or injector. Have a compression test done on the pump. Any shop should be able test this.
SOURCE: 2004 Jeep Grand Cherokee. Keeps stalling, engine
P0505 means the whole Idle Control system, not only the IAM. Check all related sensors (i.e. crankshaft sensor). Check with a voltmeter direct at the connector of the IAM if you get any signal. Remove the IAM from the TB, connect him, let someone switch your ignition key to ON. The IAM need to drive in/out for a short time to find the right position. Hold the IAM near a hard part, that they cant drive out completely! If IAM works fine, check the fuel pressure, check and clean your TB ( if not done yet). If that doesn't work, come back again please
SOURCE: jeep wrangler stalls out
check idle air control, tps & map sensor. As usual with electronics, test test test before buying anything/
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