When i floor the car wide open check engine light flashes i seems like loop status most of the time goes open never returns closed till car is shut off has and then has code p1345. Car operating temp 217, o2 sensors read when goes open loop otherwise fluctuates above and below. 450mv. Car has 150 compression on eight cyls. Smoke test shows no vacuum leaks. Has eight new plugs. New fuel filter. F. Inj. Serv. was done. Car also seems to have a rythmic idle problem while driving. Any clue?