Hey guys. This only sort of happens occasionally, but it is happening more and more lately. Early in the morning or with bad weather, my car seems to lose a lot of power and the engine will sputter when I press on the accelerator. If I am idling, my tach will bounce from 500 RPMs to 1000 RPMs. Also when I am accelerating the check engine light will flash.
I did some research on the topic and someone said it could be the catalytic converter, however I have a 3" exhaust, turbo back that is catless. I suspect it could be a bad coil pack or something? I have had a steady CEL since I swapped the exhaust, but I suspect that is because my car is catless. I never had any issues until the weather started to cool down.
This could be unrelated, but sometimes when I am heavy on the gas when accelerating, my car seems to sort of off-and-on accelerate. Like it's trying to go somewhere and finally kicks in. I know there's turbo lag, but this is much more gradual. Usually only happens in first gear.
My car is manual, 2004 GLS with aftermarket exhaust and a stage 2 clutch.
Any help is appreciated, thanks guys.