I am running a 4 pin HEI ignitor for ignition and a brand new stock replacement coil. Wondering if the HEI requires a different spec coil. At full throttle I get a very slight studder that goes away if I back off a little bit. 16g turbo at 10lbs of boost. Runs great otherwise. AFR gauge shows full rich during the studdering. I am running the NGK 7031 plugs that are recommended. Maybe I need a different heat range? Going to pull plugs now to inspect.   4 pin HEI ignitor install discussed

it can be explained in the first ten seconds of this video

Car is an '87 TSi, all stock except for a drop-in K&N, gutted downpipe cat, and full 2.5" exhaust. It ran great for the first ~5000 miles of ownership, but it's fought me ever since. Changed a bunch of parts and had it running great for a while but it's started acting up again recently.   Symptoms: It idles fine but has low power/hesitation starting off from red lights, then surges back to normal for a second, then hesitates again. It's definitely noticeable but not so bad that it's und

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