Sure it is bad gas? How does the car run?
Remember those power modules I told you about? When we were driving the LS in Cal one year, we gassed the car up and it started to run poorly not long after, missing and bucking some of the time. I thought it was bad gas, but really, bad gas these days is pretty darn rare. Quite frankly, I've never had a problem in any of our Alfas I could realistically attribute to "bad gas". It was always something else. Also, accidentally putting in lower octane gas will not hurt things if the car is driven sanely, as that engine has knock sensors to protect the engine, at least to an extent.
Turns out for our car, it was dirty connections at those power modules, not bad gas at all. Once the connections were cleaned and protected with dielectric grease, all has been fine since then. Did actually have a power module fail on the car, but Bob "goats" kindly sent me another, and it works just fine (thanks again, Bob). You can also buy those same modules on eBay, used in certain Volvos, for ~$20. I bought one, tried it, and it works fine, but I use the one Bob gave me, the other is a glove box spare, lol.
Check those connectors, cleaning and protecting them, and see if that will cure whatever ills the car may seem to have. Also, be sure to run a fuel injector cleaner such as Techron to avoid any problems in the fuel system. Using something like that, I've never had injector problems in any FI Alfa I've owned, even after 150+k miles.
BTW, if the fuel gauge reads about 1/2 full, the tank is really likely to be no more than 1/3 full, based on what the gauge reads in our LS. The 91S gauge is the same way. If the gauge reads 1/2 full, I end up putting in 10+ gallons, realistic max being ~15 1/2 gal.
Another thing to think about is which plugs are you using. Should be the NGK Iridiums for best results, IMO.
1989 Milano, Shankle Sport
1991 164S, stock
1994 164LS (~Q)
1972 Morgan 27
previously owned since 1964:
62 Morris MiniMinor 850, 67 Austin 1275 Cooper S (Downton 3/4 race), 64 Giulia Sprint GT (1st red one made), 72 Fiat 128 Sedan, 75 Alfetta Sedan, 78 Alfetta Sedan, 78 GTV, 81 GTV6, 86 GTV6
Last edited by Del; 06-29-2019 at 10:22 PM.