2002 Dodge Neon CAR IS BUCKING

ENGINE LIGHT JUST STARTED TO OCCASSIONALY GO ON.
ENGINE IS IDLING UNSMOOTHLY.
PINGING SOUND. HESITATES ON ACCELERATION.

SYMPTOMS STARTED AFTER 3 HOUR DRIVE SOME ON DUSTY GRAVEL ROAD. 3 WEEKS AGO.

PAST SHIFTING ISSUE. PUT INTO DRIVE AND INDICATOR STAYED IN PARK. TRANSAXLE FLUID FIXED THIS.
NEW PLATINUM NO GAP PLUGS IN LAST WEEK.
OIL CHANGE 3 MONTHS AGO SYNTHETIC OIL.

?CLOGGED FILTERS?

I NOTICED UNDER ENGINE, AND AT OIL PAN, FLUID VISABLE.