After a few years of mostly trouble-free driving, my wagon apparently dislikes the East Coast.

Since getting here, I started experiencing an intermittent problem - after the car had warmed up, the ignition would intermittently die. (Factory installed tachometer would dive straight to zero, no power or response to accelerator pedal.) The car wouldn't 'stall' until speed dropped off far enough, and sometimes, she'd kick back in with a hard jolt, tach shooting back up, power coming back. She'd die both from being idled for ten minutes or in the middle of an eight hour drive intermittently. I've checked all the wires under the hood, I think, all the continuity seems good, resistance at the distributor and coil seem good, I have power at the coil, and the module, plugs are new, spark plug wires are new, distributor cap and rotor are new, coil's been replaced, swapped in a used ignition module, checked the grounds. Putting a new Bosch coil in gave me a pair of good weeks, but then the problem came back - including a drive down I-95 from New England to Philly with only one stall at the very end, but the next time I tried driving her, she made it ten minutes and died. Towed home, nothing would get her started. Still dead in the garage.

Aside from going over all the wires in the ignition circuits again, is there anything I'm missing? I've got the Bosch ignition system, N/A B21 head on B23 block (this involved a bent crankshaft on the original engine), automatic transmission, GLT wagon. She cranks, the plugs get wet with fuel, but there's just no spark, including checking for spark at the coil lead to the distributor, so I'm pretty sure it's something before that in the ignition - but as I understand it, the distributor also sends a signal to the ignition module to trigger the spark in the first place?