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Does anyone know if the firing order on Amc inline 6 in 1972 is the same as later engine models. 153624? I cannot get my engine to fire on all cylinders

I may have figured it out. The guy I bought the engine from said it was a 1980. I checked the casting number and it's 3218618. Which would make it a pre 1975 and change the firing order. I am going to put it back together and try it

153624 is the firing order I have set. I bought the engine as a rebuilt so not sure on the valves. I will check them tonight.

I have a 1980 cj7 with inline 6. It's only running on the 1,3,4 cylinder. When I unplug the 2,5,6 plug wires it runs almost the same. I have checked to see if it has spark and they all have good spark. I have checked cylinder compression and it is good. Please help with any ideas if stuff...