Pontiac grandam 2,4 L 1998 PO300 - 1995 Jeep Wrangler

one, under in middle, near front seats.

Based on the symptoms you have a valve timing issue.

multicylender misfire check plugs and wires

The security system is called Passlock. And yes it will turn off the fuel injectors when it starts to fail. Go check out this link, should help inform you about how the system works along with some ways to get around it.

http://vatspasslockpasskeysecurityhelp.yolasite.com/

It could be the security system...It often times masks its self as a starter ignition or battery issue....If this is the problem turn your key to the accessory mode for ten minutes...have jumper cables and another vehicle on hand should your battery die...This seems to be a common issue on these vehicles but if this is the problem it should start after leaving it on accessory for 10 min

You mean the ICM (ignition control module), and don't forget to clean the MAF sensor.
Thank you for using fixya and keep me posted.

ck spark,,fuel,,fuel pressure

while installing the pannel you must have jarred or unplugged a connector . look around the top and side of the steering colume .

Does the noise change pitch when you weave the steering wheel right to left going down the road?

The coolant level sensor has failed. Sensors seem to be more prone to **** out than the systems they monitor.