it was running badly and getting 8MPG. OBD2 said check spark plugs... removed panel in front of windshield ,. changed plugs and ignition wires. was better but later warning lights on again. OBD2 said wires and plugs causing misfire on # 1 cylinder. off came panel under the hood in front of windshield. not too hard secong time around checked wires and plugs all O>K Then I replaced the coil unit its a one piece unit priced at $69. not bad now 3 weeks later it is still running great mileage ar 16MPG .hope this is helpful to someone else.