Question about 2000 Ford Focus
It would be necessary to run a diagnostic check on why your vehicle is still "sluggish" after replacing a major ignition component such as the coil pack. Is the "check engine" light on? If it is, scanning for trouble codes would narrow down the possible problems that your car may have. Why were the coil pack and the "throttle body sensor" replaced? Did the engine have a misfire? This is usually felt as a vibration during operation of the engine --- with loss of power and possible stalling as well.
Your description "sluggish" seems to point towards a vacuum leak of some kind; your engine may be running too "lean" and may be the result of an improperly installed throttle body gasket or intake manifold gasket. Listen for hissing sounds while the engine is idling. You may even spot a disconnected/cracked vacuum hose or a loose intake tube clamp.
Finally, try putting a bottle of fuel injector cleaner in the tank; a brand such as Lucas has gotten a lot of positive feedback and usually works within 50 miles and is good for the next 3,000 miles.
Posted on Apr 07, 2011
We had the same problem, it turned out to be the Coil Pack, which we replaced for an original one, and the spark plug cables. There was also a vacuum leak, so you should get that checked.
Posted on May 01, 2011
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Posted on Jan 02, 2017
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