Overload or dead short to ground
No power to ignition switch check fusible links at terminals just to rear of battery. No power to ignition coil, check ignition module inside distributor, fuse, main power connector to rear of battery.
something on that circuit is shorted, the short needs to be repaired.
A dead short to ground.
Head lights on?
are you sure its not rusted? cause me 92 Plymouth acclaim's oil pan rusted, and i had to get a new one. it only cost like 3-$400.
Check lower control arm bushings.
Pre-ignition.
An ignition system misfire has been detected - avoid any quick acceleration or decelleration until the problem has been repaired to avoid damaging the catalytic converter (s)
One common cause for the security light to come on is the chip in the GM ignition key. First try the spare (if you have it) if that does not work it may be the contacts inside the ignition. I am not sure if it can be repaired or if the ignition must be replaced. I have heard that the problem can escalate to cutting out the motor, so it is not something to be ignored. If your ignition key does not have a black piece of rubber with a small piece of metal in it, just disregard what I said. I hope that this information will help you get to the bottom of the problem.
Fuses of course, fusible link at the battery, bad connection at the battery, I don't know if a 98 still has the connection on the firewall, a resister, l0 gauge red wire in and out. Bad ignition switch I suppose. Corrosion at the connection in the firewall.
Clogged fuel filter, or weak fuel pump.
I am not sure what causes this, but I have had times when my ignition key would not turn. The solution to the main problem is to turn the steering wheel slightly. This usually allows the ignition key to turn.