I would try the redline. If you truly can't get it, let me know and I'll try and ship it to you. If I had a farm, I'd probably bet it on clogged injectors.

The theory is if you could imagine your injectors peeing instead of spraying. At idle, the combustion chamber starts filling up with fuel bc it's just not combusting well. When you gun it, you almost flood it, but once you burn out all the extra fuel it's like turbo boost and you have full power. Until the next red light.

Sound about like your symptoms?

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Eugene

10 E63 AMG
93 300te 4matic
07 BMW X3
14 Ford F-150 Fx2