I have almost exactly the same problem but not quite as bad, it seems to be a misfire to me. Only happens when the car is cold for like a mile or two. It doesn't bog with no load on the engine but does when under load.
My theory is bad grounding for the ignition coils.
I may have missed it but when cold does your car rev freely in neutral?
My theory is bad grounding for the ignition coils.
I may have missed it but when cold does your car rev freely in neutral?
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