Received codes P0172 System Rich Bank One, P0306-P0305, P1151H02 and P0420-
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P0420-Bank One cap efficiency, P0172 System Rich bank one. Have replaced ignition coil,spark plugs,wires, both 02 sensors and catalytic converter. Ranger is still running rough,fuel too rich, sometimes a smell like when clutch is burndt. Loss off power and misfire. There is also a k&n filter installed. Please advise what else I need to replace. I tried cleaning the MAF sensor, CHECK ENGINE LIGHT GOES OUT FOR ABOUT t that on MIN<ENGINE DRIVES GOOD AND THEN IT STARTS ALL OVER AGAIN< SAME ISSUE> Any suggestions? 97 Ford Ranger splash 4.0L 5speed
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