Can they give me a DUI without probable cause?

PC for arrest is determined by the police. PC for the legality of the stop is for a judge to decide. You'll need a good criminal defense attorney to file the motion for you in court, and to handle the dmv hearing for you. If the court decides there wasn't PC, the case should be dismissed.

From what you have said it seems that your case may be dismissed by filing a 1538.5. You will need an attorney to do this. Robert Driessen

PC is an absolute requirement before the DA can move forward with their case. It is their duty to show that there was probable cause for the stop. The facts as you have listed them would seem to indicate that there was no probable cause. However, it is also very important to know exactly what is in the police report, if the officer bothered to fill one out. It is not uncommon for officers to do a spotty job documenting why they initiate the stop in the first place. Again this is crucial for the the DA to move forward. It is extremely important that you contact an attorney ASAP. Only an experienced DUI attorney that is aggressive will know what to look for and also how to hold the DA responsible for proving their case.