Hi,
My first suspect is the ignition control module. Here are directions for replacement. The first pic below shows location. Pics 2 and 3 correlate with the directions.
2003 Chevy Truck C 1500 Truck 2WD V6-4.3L VIN X
Procedures
Vehicle Powertrain Management Relays and Modules - Powertrain Management Relays and Modules - Ignition System Ignition Control Module Service and Repair Procedures
PROCEDURES
REMOVAL PROCEDURE
pic 2
1. Remove the air cleaner outlet resonator.
2. Disconnect the ignition coil driver electrical connector (3).
3. Remove ignition control module (2) screws.
4. Remove the ignition control module (2) and heat sink (3).
INSTALLATION PROCEDURE
pic 3
1. Position the ignition control module (2) and heat sink (3).
NOTE: Refer to Fastener Notice in Service Precautions.
2. Install ignition control module (2) screws.
Tighten
Tighten the screws to 3.5 N.M (31 lb in).
3. Connect the ignition coil driver electrical connector (3).
4. Install the air cleaner outlet resonator.
______________________________________________________
Let me know if this helps.
Joe
Images (Click to make bigger)
SPONSORED LINKS
Wednesday, June 24th, 2020 AT 7:05 PM