Re: 1991 TBI and HT 383
If you put the HT383 on the ECM will need to be re-tuned to run it. You can try the chip route. Or you could do something like a megasquirt or EBL Flash. I run the EBL flash system from Dynamic EFI - its a steep learning curve but once you "get it" then its easy to use. I also bought a Wideband O2 sensor which helped a ton for tuning the TBI. I have no idea but I was running about 16:1 AFR at WOT - which is bad news. I have an adjustable fuel pressure regulator so I cranked it up to 16 lbs and a lot of tuning later it really made it come alive.
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