1998 Mercury Grand Marquis GS hesitation when accelerating?

jack

New member
I just replaced all the spark plugs and the car still lags when accelerating sometimes. It doesn't happen all the time, but it happens often now. The car runs great besides this. I'm going to replace the fuel filter (It's the original) and clean the MAF tomorrow, but I was wondering if someone thinks they may know what's going on? I have no check engine light ether.
This happens when I'm just cruising too.
 
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