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Mine does the exact same thing. Starts great in the morning. Runs great. But try and start it 15 minutes after cutting it off and it takes for ever. Then once it does start it runs real rich. Then about 30 seconds later it 's idling good no problems. On mine the fuel line is original. Carb is a replacement Q jet put on by the previous owner(about 3 years ago). One last thing If I let mine cool down (say about an hour) it starts right up, and idles fine. It's only after it has sat for about 10-15 minutes. Not to jump all over Rapid's post, but I'm very interested in the replies, also. Thanks,
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1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs
1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX
1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears
1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now.....
1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone.
1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed.
1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm 
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