I got up this morning and started my 2003 Jeep Liberty Renegade up to warm it up as I live in Michigan, when I went to leave I noticed the engine sounded horrible, it was chugging and the check engine light was flashing. I took it to a local auto parts store and had it scanned. They told me it said the engine is misfiring on cylinders 1 & 6. Any ideas on what to do to cure this? It's Christmas time and we're on a totally tight budget, but this is our only vehicle. Thank you so very very much for your help!