Red Line is
AFAIK the only detergent-based cleaner, unlike Techron et al it does not contaminate the oil and does not have (nor need) warnings on the bottle to change the oil or limit its use per oil change. Techron is bad IMO, has NEVER made any perceptible driveability change in any CIS car (I've tried it several times), is solvent-based, and when you dillute solvents that much you're just "pissing in the wind". Easier to just pour some nail polish remover in the tank, ...
RedLine actually worked for me and others on CIS systems that exibited the typical bad spray pattern at idle and low flow symptoms of: occasional miss at idle and soft part-throttle acceleration to hesitation on light throttle increases. One full bottle for the first dose will change your driveability within 100miles IMO, has for me, was all that I used in CIS cars after I was fortunate enough to try it (found out about it because I use their syn oil and Water Wetter).
You can buy it from Amazon, or go to their website to find a local supplier, ... a little hard to find.
A bottle is IIRC around $12 retail, will treat 150gallons at a maintenance dose which I try to remember to put in my gasoline vehicles. I really haven't seen as much difference in later injection systems, but in CIS Mercedes/Audi/etc. cars I was always happy with what it did, for not much $$. I hope that you find it and it solves your driveability issues.