I just changed the oxygen sensor and put some fresh 93 octane gas and a bottle of injection cleaner. I take test and I failed.....The hyrdocrabon levels are still too high at idle..the normal is 220 and I reading 290.. at idle.... I went twice for test and failed twice this week, second time I failed hydrocarbon at cruise as well for first time...I have been driving the car for 3 days straight now....need help!!!!!! What next???