Off Idle Missing 1987 GN

[Kent Huber]

1987 GN
-all stock engine components
-stock MAP sensor
-cold air intake
-42 lb injectors & TurboTweak classic chip
-pump gas

I've been running the upgraded injectors and chip for some time with no issues. recently, I started having off idle missing that seems to get worse as the engine warms up. I don't have a scan master yet.

At some point, I may have had a mouse in the engine compartment for a short time. Looking into making sure all wiring intact. Nothing stands out yet. not sure if this coincident with my issue.

without a scanmaster, what recommendations would have for me to diagnose and solve this off idle issue. Any help or suggestions would be greatly appreciated.

 

[EricM]

If it sounds like one cylinder missing, I would unplug one injector at a time, while idling (or just above idle), to see which one doesn't make a difference. At least you might narrow it down to one cylinder, then go from there.