at first it wouldnt go over 55mph and it was something with the muffler so that got fixed, but it had been sitting for a while and sometimes it wouldnt stay started. after all the fluids were through it she ran like a dream.my dad took her to work and he said she was was running poor in the morning and he went to leave and she wouldnt start. she turns over but wont start.sometimes it sounds like shes not getting gas but not for sure what it is. any sugguestions?