Sputtering wile in drive
I am presuming it didn't missfire before the tune-up?
You could have damaged/cracked a plug installing them (the gap was checked?)
You may not have a plug wire securely on or mixed up the arrangement/firing order.
If it misfired before and that was why you were doing the tune up - then it is highly likely an injector is malfunctioning.
If this doesn't help - please give us the: Year, Make, Model & Engine - will help with any further assistance.
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