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Duratec Lack of Power
98' Sable w/duratec, 92,000 "pampered" miles. All maint., filters, etc. performed as recommended. Use injector cleaner at every oil change (3,000). Car had major tune-up, new plug wires, throttle body cleaned at 88,000. Ever since, have noticed lack of power when taking off from a dead stop (red lights, etc.) usually with AC on. Once car gets started it will accelerate rapidly. It's as if it boggs down and then takes off. No problem with idle or normal driving. Just happens with moderate acceleration from a stand still. Otherwise, engine performs great and has lot's of punch at high speeds. Also, gas mileage is DOWN about 3 mpg. since tune-up. Anyone have any ideas?
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