I have a 92 Corrado SLC (Dizzy VR6). When I bought the car I got it with the stock chip installed (car was completely stock) and a "Autothority" chip thrown in.
I installed the Autothority chip and all was good for over 3 months now. Then recently I started getting a very odd misfire and was running lean. I reinstalled the stock chip and everything is normal again. So I take it the chip crapped out.
Now I'm looking for another chip, and have read all the suggestions to go GIAC. I went to their site, and they have a separate listing for the coil pack VR and the dizzy VR, but don't give a part number or sell them on there. I went to a couple dealers' sites (MJM, FourSeasonsTuning) and they only list 1 item to cover both... So I started browsing the classifieds for distributor specific, but all of them are selling the OBD1 dizzy ECUs with a decoding board... My stock ECU doesn't use a decoding board, and the Autothority chip worked fine for over 3 months without a decoding board....
So do I need a decoding board or not?
Thanks for any insight..