fuel control solenoid, emission control relay

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no idea. it still wouldn't stay running (after replacing fuse)without assistance. I.e. foot in the gas or choke pulled out. I drove it quite a distance and it gave me the same trouble at every stop along the way. the next day I went to mess with it and it fired right up, stayed running w/o assistance. idk what it was. it's been good now for about 2 weeks. my tach still goes out intermittently tho. and it was fine before the issue stayed with fcs .
 
If it is in and out like that, sounds like it could still be an electrical problem...bad ground somewhere...you could go through and clean/refasten those grounds in the diagram and test out those parts to be on the safe side...
 
I am having similar problems as the original poster of this thread. No blown fuses. Truck ran great, then next day it wouldn’t idle, had to choke it. Drove it a few hundred miles and it idled just fine. Next day same problem. I thought vacuum leak, then carb gunk passing through, but now I’m thinking electrical. Thoughts?
 
Take the cover off the emissions control relay ( once removed from vehicle) flip the circuit board over, and with a magnifying glass look at the cold solder joints for the plug pins. If you see cracks resolder all of them. Another overlooked possibility is poor contact condition ( high resistance) in the electrical portion of the ignition switch. It probably has been put through a few 100,000 cycles. Nothing is forever.
 
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