What I have done since is change to delphi 415cc injectors which now idle fine and exhibit much better throttle response and run a haltuner O2 sensor to fine tune the mixture since the injector change. I am fairly confident the mixture is OK, I have used this haltuner on my supercharged 8v with good results and my spark plugs, if anything, look like they are on the rich side, a bit carboned up but not overly.
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Pros: better throttle response, idle fine
Cons: spark plugs rich side
Bosio PP520's from Kerma, with the requisite red 'I' front and back! ... should be standard equipment on this car.
Pros: should be standard equipment
Vehicle:
Volkswagen
I grabbed the 24# mustang injectors for 75 bucks once. Use an ohm meter to measure the resistance of your original injectors and your new ones, if your new ones aren't even close, use a resister in line to make up the difference.
Pros: cheap, easy to find
Vehicle:
Ford Mustang
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