then there has to be something wrong, like the wiring to the ign cyl. theres going to be a couple wires that go to the ign cyl. you need to see if they have a resistance and arent open. i havent taken one of those apart so i dont know how to be more specific, but the little wires like to break in the steering column. usually you can read the original resistance and put some resistors in the circuit cut back under the dash.but you dont have it
this is what i would do if it was my car, buy this
and hook it to your ipc
if your ipc is bad somehow this still wont fix it but 25 for the bypass module is likely less than what you could try replacing the ipc for.
1998 Bonneville SSE
2007 Monte Carlo LT-KYB, Clarion, Polk audio, Kicker
1999 Yukon SLE-KYB, Air lift, Reese dual-cam, Tekonsha
1987 Firebird-355/th400-nothing stock