Whats the best way to determine if my 1995 honda civic has an intake air leak?

Just partially rebiult my 1.5 liter honda civic , engine appears to have a miss fire engine is looping or missing @ idle and was stalling while comming to a stop after driving. {@ a red light}. I know the battery is def not holding a charge. Engine was burning oil,replaced piston rings all,replaced con rod bearings,flex honed jugs and cleaned oil pan and pick up screen new PCV valve, lined up timing marks as directed in HAYNES manual on cam shaft and pulley which I replaced. All belts are new 4-2-1 chromed header. Please send any possible input and thank you for your time.