CasperGT2
Newish Member
- Joined
- Jan 20, 2026
- Messages
- 6
- Reaction score
- 1
- Points
- 3
2020 GT2
- K&N CAI
- MBRP catback exhaust
- DC Sports Mid pipes
- Single ADD W1 Catch Can
- JB4 with EWG wires and fuel wires (JB4 was recently installed on January 31, 2026)
- Brand new ignition coils
- Brand new HKS plugs gapped to 0.022
- I only use 94 octane or 93, no lower
- Running MAP 1
So around 2k rpm or a little lower sometimes CEL comes on and power cut until I turn the car off and on again and when stopped and coming to a stop once CEL is on car shakes a lot. Seems to happen when going up a hill in low rpm’s. But today it happened just cruising and rpm’s were again around 2k rpm. No codes get thrown unless it happened again within a short amount of time. Codes have been misfires from different cylinders. But when the code shows the cylinders that it’s saying it is aren’t always the same as the last time the code popped up.
Another issue, could be related but I don’t know. But when stopped and when CEL isn’t on, sometimes rpms will sit high around 1k making a revy sound like it’s idling night. And occasionally car will shake (not usually when rpm’s are around 1k idle.
All these symptoms happened before JB4 and was told JB4 would help. It didn’t. Not with these issues anyways.
Trying to diagnose it as much as I can before going to a dealership. Since I am modified I’d into refrain from going to a mechanic. Especially because obviously I don’t want to undo everything so I don’t void warranty. Especially since those symptoms happened before modifying it. Except for the first part of this txt. That seemed to maybe happen somewhere around when I did CAI and exhaust stuff.
- K&N CAI
- MBRP catback exhaust
- DC Sports Mid pipes
- Single ADD W1 Catch Can
- JB4 with EWG wires and fuel wires (JB4 was recently installed on January 31, 2026)
- Brand new ignition coils
- Brand new HKS plugs gapped to 0.022
- I only use 94 octane or 93, no lower
- Running MAP 1
So around 2k rpm or a little lower sometimes CEL comes on and power cut until I turn the car off and on again and when stopped and coming to a stop once CEL is on car shakes a lot. Seems to happen when going up a hill in low rpm’s. But today it happened just cruising and rpm’s were again around 2k rpm. No codes get thrown unless it happened again within a short amount of time. Codes have been misfires from different cylinders. But when the code shows the cylinders that it’s saying it is aren’t always the same as the last time the code popped up.
Another issue, could be related but I don’t know. But when stopped and when CEL isn’t on, sometimes rpms will sit high around 1k making a revy sound like it’s idling night. And occasionally car will shake (not usually when rpm’s are around 1k idle.
All these symptoms happened before JB4 and was told JB4 would help. It didn’t. Not with these issues anyways.
Trying to diagnose it as much as I can before going to a dealership. Since I am modified I’d into refrain from going to a mechanic. Especially because obviously I don’t want to undo everything so I don’t void warranty. Especially since those symptoms happened before modifying it. Except for the first part of this txt. That seemed to maybe happen somewhere around when I did CAI and exhaust stuff.