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nmal · 03-25-2026, 06:48 PM

About 8 months ago I did FBO to my car with the following mods:
- Rotofab CAI
-Flex Fuel Kit
-LT5 95 MM TB
-LT2 IM
-Stainless Power LTH with high flow cats

The car drove fine for a while (or maybe I just never noticed it before) but a couple months after install I have a stutter when accelerating. When I give light throttle from anywhere from 1k-3k RPM, the acceleration stutters. Its hard to describe or get on video, but the best explanation I can think of is if you make a "vvvvvvvvvvvvv" sound and quickly shake your head up and down while making that sound, thats what the stutter sounds like. The acceleration is choppy and you can feel the car lurch forward and backwards as it stutters. This does not happen all the time, and when giving more throttle it seems to skip the stutter a majority of the time. The car has 30K miles and seems to idle fine.

I already replaced the spark plugs, and replaced one or two questionable plug wires. There is not one specific cylinder that misfires more than others on HP tuners, so I doubt it is a bad coil pack. Car is tuned by GPI so I doubt it is a bad tune either. I was thinking it could either be:
1. Bad/clogged injectors
2. Slight intake leak from under LT2 IM
3. Slight leak near exhaust clamps

The similar issues I've read on here have been bad injectors so that's what I'm leaning towards but I want to be pretty confident before I buy new injectors. Anyone have any thoughts?

03-25-2026, 06:48 PM	#1
nmal Drives: 2023 Rapid Blue 2ss Join Date: Oct 2022 Location: SoCal Posts: 44	Stutter/Choppy on Acceleration About 8 months ago I did FBO to my car with the following mods: - Rotofab CAI -Flex Fuel Kit -LT5 95 MM TB -LT2 IM -Stainless Power LTH with high flow cats The car drove fine for a while (or maybe I just never noticed it before) but a couple months after install I have a stutter when accelerating. When I give light throttle from anywhere from 1k-3k RPM, the acceleration stutters. Its hard to describe or get on video, but the best explanation I can think of is if you make a "vvvvvvvvvvvvv" sound and quickly shake your head up and down while making that sound, thats what the stutter sounds like. The acceleration is choppy and you can feel the car lurch forward and backwards as it stutters. This does not happen all the time, and when giving more throttle it seems to skip the stutter a majority of the time. The car has 30K miles and seems to idle fine. I already replaced the spark plugs, and replaced one or two questionable plug wires. There is not one specific cylinder that misfires more than others on HP tuners, so I doubt it is a bad coil pack. Car is tuned by GPI so I doubt it is a bad tune either. I was thinking it could either be: 1. Bad/clogged injectors 2. Slight intake leak from under LT2 IM 3. Slight leak near exhaust clamps The similar issues I've read on here have been bad injectors so that's what I'm leaning towards but I want to be pretty confident before I buy new injectors. Anyone have any thoughts?