Looking at going back to a carb!!

[eschaider]

Originally Posted by MJJ

why not take it to a professional and have a custom dyno tune?

^^ This is your correct fix.

You are clearly unfamiliar with how to tune an EFI system so go to the professionals and stop wasting time and money. The EFI will outperform a carb in every aspect you can measure.

On the other hand if you want a carb, for what ever reason, go buy one and put it on like we all have done for decades. Smaller ones perform better at low engine speeds and bigger ones perform better at high engine speeds.

Use a wideband, as has already been suggested, and dial it in. You will surrender some drivability, mileage and cold start manners but it will work just fine - like they always have.

Sell your EFI to someone who wants and knows how to use one and repurpose the dollars for something else on the car.

Ed