[Funracer]

Originally Posted by GSJoe

You're getting lots of good advice here from people with lots more mechanical "savvy" than I have, but I need to suggest something you may have already done, and if not, you must do it whether or not it's the cause of your miss issue. Let me explain. Last year my young friend Matt who owns a '91 experienced a similar miss issue. We did just about everything--plugs, coils, wires...tons of other checks. We chased our tails in vain for months. In August at Carlisle, however, Matt talked to the smartest ZR-1 guy who exists in mho, Marc Haibeck. He gave Matt the trick we implemented when we returned home to Charlotte, and the problem went away. Here's what you must do if you haven't done so already. First, take out those old plugs--I don't care if they're new--and throw them away. Get yourself a brand new set of AC plugs of the right heat range and install them. Next--and here's the trick Marc Haibeck gave Matt--get yourself a 3oz can of Permatex Dielectric Grease (item #81153) at any Advance or AutoZone parts store. (I'm sure other versions of dielectric grease will work, but this one dispenses easily from a narrow nozzle because the can is pressurized.) Put the nozzle into each spark plug boot AND COMPLETELY FILL IT with the grease before putting the boot on the new plug and do the same with the remaining seven. OK, why does it work? According to Mark, the extremely high intensity discharge from that ignition system causes air trapped in the spark plug boot to ionize. When it does, the spark then takes an easier path down the outside of the plug rather than through it. If you look at your existing plugs you'll probably see several with a very fine burn line on the insulator where the spark has been tracking. That's why you must replace the plugs again when you do this. As I said, if you've already completely filled those boots with dielectric grease and the problem still exists, I apologize for the verbosity of this post. If you did not, however, do so. It's a must, and even if your problem does not go away it will prevent another common and similar one from occurring. I sincerely hope this helps you.

Never heard of this before but I too am chasing a stumble and am willing to try this to see if it helps. Anyone else tried it or know if it works?