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Here's the scenario: on 300 mile trip to ranch last weekend, '87 240 wagon burped occasionally during the last 50 miles with tach dropping to the peg whenever engine lost power. Burps were momentary and tach jumped right back after half a second or so and engine began pulling again. Burps became longer, maybe one to three or four seconds, then finally the car shut down completely. All electrical was normal except tach (radio and lights kept working fine). Disconnected center wire at distributor and placed it 2 mm from ground, cranked and got no spark there. Left car sitting in pasture for week. Went back to ranch a couple of days ago and replaced the distributor with boneyard unit. Car fired right up and drove 300 miles back home yesterday, never missing a lick. This morning, wife drove car to work, then called me to chew me out but good. It seems car is doing exactly what it was last week, occasional dead misses with tach dropping to zero at the same time. This time she reports in addition that tach is bouncing a lot---I assume that she means it is grounding over and over rapidly, but still connected enough to be able to keep running, at least roughly. I assume that the ignition is somehow grounding intermittently or losing a firing impulse intermittently. Any ideas?
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