Engine overhaul, depends on what needs to be changed. But not too expensive, I think about 500-600 for top overhaul and 1.5-2.5k for full overhaul for your engine.

Regarding spark plugs fouling, this could mean your car is out of tuned, send it to someone to tune your car after the overhaul.

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Added on September 15, 2011, 5:54 amAnd typical time for a full overhaul is like 1-2 weeks.

This post has been edited by GEFORCEXTREME: Sep 15 2011, 05:54 AM