a lot of black smoke and smelling like fuel when running this forklift has a Mazda engine, inspected spark plugs, only 1 looked like a bunch of soot and smelled like fuel, others appeared normal. runs rough at idle changed the in-line fuel filter and air filter no changes probably runs a little worst. No problem starting just running erratic and smokes with fumes. Any advice what to check or purchase to eliminate this problem?
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