car is getting 5-8 miles a gallon, black smoke out tail pipe, hard to start, on 1997 Mitsubishi Galant

1997 mitsubishi galant 165,000. Black smoke out tail pipe, hard to start when it sit for a while, 5-8 miles a gallon, exhaust smell up front. Have done fuel injection flush, changed spark plugs, change idle control value. What else can I do????

by in Frisco, TX on May 21, 2010
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1 answer
ANSWER by , October 04, 2010
change the head gasket and take the heads to machine shop to be test it for worn valves seals