I have a 1996 for taurus with 3.0 engine. it idles rough and gets very poor mileage. Check engine light is blinking, but i don't know what the codes are. Engine has half the power it seems when going downthe road at up to 50 mph, after that feels like something opensand enginepulls up to speed limit with no effort. Sofar I have replaced spark plugs and wires with no chage. alsoused bottle oninjector cleaner. Any suggestion where to look next?

Optional Information:
1996 Ford taurus 3.0

Already Tried:
replaced spark plugs and wiresand used injector cleaner