What causes an engine to just start to run rich?? I recently replace my
plugs and checked them today....they were almost black with soot. The old
plugs that I replaced were the "proper colour."   My gas mileage is crap
eventhough I replaced the plugs, wires, fuel pressure regulator, thermostat,
water pump, distributor, rotor, air filter, cleaned the FI ground
wires.............I'm stumped.
help!!!!!!!!!!

Chad 85GL