I put a bottle of fuel injector cleaner in a full tank of gas this morning and then drove about 20 miles. The car set for about 3 hours and when I got ready toleave it was hard to start. I drove about 5 miles and parked for about 5 minutes. She was even harder to start. Tonight at home I tried to start her to pull into the garage and she want start period. Did the cleaner do this or is it coincidence? Once the motor was running today, it ran great. I put the cleaner in because of a rough idle. What demon has moved in?