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From: Minnesota in the summer, Las Vegas in the winter
problem with 1972 SB
I have a 1972 350 manual with air conditioning. Nothing is original. And I mean nothing. When I start it up it runs fine. About 10-15 minutes after driving, when it comes to a stop, it kills. Nothing is there: absolutely no electricals. If it is left to sit for 30 minutes or so it will turn over and fire up easily. It does not seem to die on the move: just when it comes to a stop sign or pulling into the driveway.
Obviously I can't take it anywhere because of this unreliability.
I would go for that engine ground cable under the engine mount on pass side.....WHEN it goes, you get the oddest crap symptoms, and you obviously need pull it apart, shine up all the metal, grease it down against corrosion, and bolt hell out of it....
maybe go for the same under the battery box to the frame.....
also pull the firewall connector and check for corrosion, bad wire....that is near the steering column, backside of the fuse block.....also check you fuse block, they will corrode with the steel fuse clips not liking the copper bus feeds they crimped to....and so dissimilar metals after 40 years.....also fiddle with the ignition switch, you maybe have to drop the column to do that though.....I not so much talking the key/linkage as the switch itself.....maybe outta adjustment??? the switch slides up/down the column via loosening a couple mounting bolts....
also check the fusible link off the bat stud on the starter, see if you can induce a failure by beating snot out of it....