MSD cant change a rich mixture. You need to look at the carb as mentioned above. Dont fire the parts gun and buy a bunch of stuff. Find out the why, then figure out the how (to remedy it).
If you haven't made any changes to jetting, I would make a call to Quick Fuel and tell them what is happening. Then ask for advice on jetting it down. You also need to check the power valve(s) to make sure they are not blown. Why are you running a colder plug? The engine calls for an R45 or 46TSX with a .060" gap. You would probably be better off with a Quadrajet built for your engine.
There is 0 reason to buy another carb....that's spending money you don't need to.......what gets are in there.....how does it idle. Where are you micture screws set at, what power valve is in it
I think it would really help if Deenice told us about the engine in this car. Is it stock, modified, exhaust, gearing, etc. Are you running a cam?
ta 212...bored 30 over..after market eldenbrock intake...just little bit over stock...scotty pg built my motor
sounds like a lot of performance mods...I'd get those plugs blasted clean or replaced & re-gapped, then dial in your stock ignition timing & lean it out to where it idles as close as possible to stock RPM, then adjust timing/idle mix screws, then move on to rods/jets.
When I was a mechanic, the old timer said that any spark plug that has been badly gas fouled should be replaced. I learned the hard way for about a year that he pretty much knew what he was talking about. Plugs are cheap and not tough to change...
Any plug that is sand blasted clean WILL foul again and relatively quickly. As Ken said, plugs are cheap and should be replaced not cleaned. I know, I know. "I've cleaned plugs for years and never had a problem", "My dad always said..." blah blah blah. After playing this game for 40 years, take my advice. Just buy new ones, gap them properly and to the correct gap and go make power.
New. As in brand new - out of the box the day you put them in However, I would hesitate to put new ones in at this point, at least until you figure out what’s wrong and why it happened. Bound to ruin another set. There is some solid advice above to help diagnose what’s going on. Personally, I’d start with the carb... and a rebuild kit.
Maybe it's my monitor, but those plugs don't look "wet" to me. They're black, running rich. MAYBE getting some oil, but almost certainly from too much fuel. "I" would clean them with a propane torch. Get the porcelains nice 'n' white again. I've had reasonable luck with this, but even if it's not a long-term solution, at least you're starting fresh for further diagnosis without spending a heap of money on new plugs every time you try something different. Re-adjust the idle mixture screws for best vacuum, then lean-drop about 1/4--1/2 inch of vacuum. See if they burn cleaner once the idle isn't pig-rich. Is there a choke? Is it adjusted properly? If not, fix that, too. How about spark advance? What is initial, total, and vacuum advance? If idle and choke don't take care of it, maybe looking at jetting changes, and after that, air bleeds and idle restrictions and all the rest of the "difficult" tuning. But don't rule out the fact that the plugs may just be too cold.
