I had the same issue with my venture. It turned out to be the number 5 plug wire, backside of engine ended up breaking out of the plug carrier and burning in half on the manifold. Your best bet is to trace all the wires to start off with and change the plugs. If that doesn't help, it may be internal. Good luck
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Misfiring changed plugs and wires. Still running rough
91 chevy truck rough idle die no spark
Engine still runs roughv.
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