97 Aurora with P1377 Fault code

Code reader gives message IC cam pulse to 4x reference pulse. Also getting p0302 with message the #2 is miss firing. On my Buick I had the same misfire and codes when my ECM wiring was messed up. But here the wiring seem fine. Could you give me suggestion as to were to start in running this down? Thanks
Wayne
DTC P1377 - IGNITION CONTROL (IC) MODULE CAM PULSE TO 4X REFERENCE PULSE COMPARISON Circuit Description
This test checks to see if there are eight 4X reference pulses between CAM signals. Do not attempt diagnosis or repair unless vehicle is experiencing driveability problems associated with this DTC. Diagnostic Procedures
1. Perform ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK. See the F - BASIC TESTING article. After performing OBD system check, go to next step.
2. If any other DTC(s) are present, diagnose affected DTC(s) first. If no other DTC(s) are present, go to next step.
3. If this DTC is set along with a driveability complaint, go to next step. If DTC is not set along with a driveability complaint, fault is not present, see DIAGNOSTIC AIDS.
4. This DTC will set when are too many or too few cam or 4X pulses. Check for Electromagnetic Interference (EMI) being induced in the fuel control circuit, cam signal circuit or camshaft position sensor circuits by improper spark plug wire routing or high power transmitter operating in the vicinity. Correct any causes of EMI. If EMI is not present, go to next step.
5. Check for intermittent short to ground, circuit shorted together or open in fuel control circuit, cam signal circuit or camshaft position sensor circuits. Repair as necessary. If circuits are okay, go to next step.
6. Check terminal contacts at camshaft position sensor terminals. Repair as necessary. If terminal contacts are okay, go to next step.
7. Check terminal contact at camshaft position sensor to IC module.
Check terminal contact at fuel control circuit and cam signal circuit to PCM.
Repair as necessary.
If terminal contacts are okay, fault is not present.
Diagnostic Aids ,Since this DTC can set under normal conditions, no diagnosis should be performed unless a driveability complaint is present.
This DTC may also set if all 4 camshafts are off by one tooth (10 degrees BTDC), causing a severe driveability problem. NOTE: For circuit reference, see the L - WIRING DIAGRAMS article.