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So some back story , was running headers and switched back to my old stock cats that have been sitting for a year… drove around for a couple weeks and now it’s been misfiring. Idles really rough , I changed spark plugs . No luck. Could it a be manifold leak. I reused the gasket Bc it wasn’t horrible… other mods include intake manifold riser , short intake , catback exhaust, ark downpipes .
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switch around the spark coils to known good cylinders and see if the code follows the coils.

If is the coils, squeeze the rubber end of the coils and check for cracks. It's difficult to see cracks in silicone unless you flex it.
Also check to see if the little spring is in the coil. If you look inside a good coil you will see what I'm talking about. Those are known to fall out.
 

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Hey the same thing is happening to my right know I am misfiring 1,5 and system to lean bank 1 and bank2 what you did to fix it can you help me I change the coil spark plugs and injectors and nothing help .
 
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