My father in law had me post a question for the cj guys.
4.2 with weber carb. Jeep starts but runs on 3 cylinders. There is spark on the 3 wires. Intake is clear. Compression was high,140 in each of the 3 cylinders. Were talking the back 3. Anyone else have this issue? I can answer questions
Of course. New distributor as well. Plugs are the correct gap. Spark was tested with a spark tester on every wire. Timing was verified also.
Valves are opening and closing. Carb has the correct spacers.
I don't think a dual plane manifold would make a difference on why the back 3 cylinders are lacking fuel. If spark is there and the timing order is correct, look towards the carb and how it's set up. Are the plugs even wet?
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