I have a 1994 Cheyenne 3500 that I changed from EFI to carborated. It has a standard 350. Now here is the weird part. It runs great for 55 to 60 seconds then dies. Every time. I’m guessing it’s something in the mass of electronic wires that are no longer hooked up but I have no idea where to start. Has plenty of fuel and plenty of spark. I tried jumping a hot wire directly to the distributor and It did the same thing. 55 seconds. Any help would be appreciated.
thanks.