While driving at different speeds there is a jerking, does it worse from 80-100. It does it randomly at any time, I thought injectors but fuel economy is still good and drives normally when it doesnt do it. It does it on short and long trips, sometimes it doesnt do it at all but most times it does. Could be electrical? While the aircon is on it doesnt do it it seems. It was getting hot so replaced the thermostat and that fixed that issue, coolent replaced and doesnt loose any. Now the heater heat isnt coming through as much, it does for awhile then goes cold for a bit and then will go warm again. Blocked heater core or Heater Flap Actuator maybe? It hasnt thrown any codes. Any help would be grateful
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