Two days ago the car was driving superb. weather was 58 degrees and i went to refuel, the following day the temp outside dropped to 18 degrees and the car started to hesitate on acceleration. The car would not accelerate unless I gradually give it gas, once i reach 3k RPMs it seems to operate alot better then at500-2500. Could i have gotten bad fuel? iam waiting till i finish this tank and refuel from another gas station. There is also no check engine light, however iam still getting code 19 (Fuel injectors-open or short circuit or Emission control system adaptation at limit) with the blinker under the hood. I received this code before and the car ran fine, not sure if its related at all. Again the car started to hesitate after an immediate drop in outside temp and refuelling at a new sunocco gas station, any advise? Can i add injector cleaners? why isnt there a check engine light? Thanks again on any feedback.