fouled plugs

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TGREEN8371
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I have a 97 olds bravada V6 with 130,000 miles. My fuel milliage went way down to 6 mpg. The 1,3,and 5 plugs get fouled with black soot when the engine is started. I have replaced the head gaskets, and the normal tune up stuff (ie plugs, wire, cap, rotor) and put in injector cleaner. The engine runs fine at itle and not in gear, but no real power while in gear unless petal is on the floor. What else could cause half of the engine to foul out
Oct 31, 2007 at 9:09 AM
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BLACKOP555
  • ✓ASE Certified Mechanic
  • 10,386 POSTS
  • ASE Certified Mechanic
too rich a fuel mixture would be my guess. check the MAF sensor and scan the car for trouble codes
Oct 31, 2007 at 7:22 PM
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TGREEN8371
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I replaced the computer yesterday, the onboard MPG is still saying I am only getting 3-6 miles per gallon. Before I had done anything to it, it was getting about 6 miles to the gallon.
Nov 1, 2007 at 9:22 AM
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