The last set of Autolites I put in a vehicle (a '79 Jeep CJ7) I was not happy with, it had a miss until I reinstalled the old plugs. If they didn't look fouled I'd try putting the old plugs back in it just to eliminate the plugs as a cause.

'18 Ford Raptor, random motorcycles, 1968 Plymouth Fury III - 11.37 @ 118