I Might Just Know What I'm Talking About
Join Date: Jan 2000
Location: Charleston, South Carolina
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The cap having a "little play" shouldn't be the problem.
Go back to the start, and make sure you have the distributor in correctly. Make sure the timing order is correct. Then make sure you are getting gas to the engine. Check the simple stuff first.....
If the engine was running, and now it's back firing it's got a problem in the timing. Hopefully, the distributor wasn't tight (like Jim Lou said) and it's just jumped out of place. That's an easy fix. Pull the distributor cap off, rotate the engine to TDC, then re-install the distributor pointing to #1 cylinder's tower position.
Oh... and if it's back firing, it's getting gas........