if it don't have a 3 wire o2 sensor install one ,my 4.3 would go open loop at 30mph in 5th 3 wire sensor fixed it.if it has a 3 wire check for exhaust leak if engine's not been modified. or as stroked said
if it don't have a 3 wire o2 sensor install one ,my 4.3 would go open loop at 30mph in 5th 3 wire sensor fixed it.if it has a 3 wire check for exhaust leak if engine's not been modified. or as stroked said
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