87ChevyR10
Full Access Member
- Joined
- Sep 2, 2013
- Posts
- 1,125
- Reaction score
- 66
- Location
- Kansas
- First Name
- John
- Truck Year
- NA
- Truck Model
- NA
- Engine Size
- NA
Hello,
Since adding the new headers and exhaust, I have noticed the truck misfires/afterfires a bit until it warms up. When I did the exhaust a few weeks ago, I also replaced the plugs with NGK Plats and put on new plug wires. To my surprise, the old plugs showed normal wear (a good thing for older vehicles).
I am thinking maybe the ICM is having trouble, but I'm not getting any other symptoms. I am uncertain how old the cap, rotor and coil is. The truck has good power. It doesn't hesitate or anything under load.
Any ideas as to where to start looking? Thanks!
Since adding the new headers and exhaust, I have noticed the truck misfires/afterfires a bit until it warms up. When I did the exhaust a few weeks ago, I also replaced the plugs with NGK Plats and put on new plug wires. To my surprise, the old plugs showed normal wear (a good thing for older vehicles).
I am thinking maybe the ICM is having trouble, but I'm not getting any other symptoms. I am uncertain how old the cap, rotor and coil is. The truck has good power. It doesn't hesitate or anything under load.
Any ideas as to where to start looking? Thanks!
