Hey guys! I finally got my '86 on the road a couple weeks ago. I ended up pulling all the wiring back apart and cleaned everything up nice, and it fired right up! Car ran amazing for about a week, then started misfiring a little bit. Ever since then, it's gotten progressively worse. I thought maybe I was crossfiring 1/3 and/or 5/6, so I rerouted the plug wires. Car ran perfect again for about ten minutes, then started bucking harder than ever. Now it's misfiring randomly and fairly often, at least once every few seconds. Occasionally it'll string a few together, fire again a couple times, then die. Sometimes ("sometimes" being the key word) mashing the throttle will clear it up, but it's always back as soon as I let off the gas.
What has been done recently:
Salt and pepper 10-pins cleaned up. Continuity checked through all wires in the harnesses. Grounds checked.
Double and triple checked the timing. I believe the balancer is accurate. Set at 14* on ethanol-free 93 octane.
Changed the fuel filter/added injector cleaner.
Rebuilt the distributor with a new PIP and TFI module a couple months ago.
New IAC, which cleared up a hanging idle issue I was having.
New plugs. No change.
Regapped them to .052 (they were pregapped to something like .040). No difference.
New plug wires (one of the wires had a crack in the insulation). No appreciable difference.
Did the nighttime wireset check. Didn't see any shorts/arcing, even when it was obviously misfiring.
New ignition coil. Same story, no change.
Injectors all seem to function. When I spin the distributor by hand (out of then engine), I can hear them all clicking.
Only codes that showed up had to do with various pieces of smog equipment being deleted (car has no smog pump, EGR, cats). Anybody have an idea what it could be, and is there anything else I can do to check other buying a crapload of noid lights and spark plug testers?
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