00 durango R/T 5.9L 157k miles just bought 3 weeks ago no back past on matiance but looks well taken care of runs perfect till few days ago and again now. it cranks but wont start. last time 5 days ago it did this i replaced the starter relay and it started right up in a single turn and worked perfect since drove it at lest 13 times since then. this morning its coverd n snow and it wont start. it cranks seaming to be fine but will not turn over same as b4 this time switching the relay did not help at all. i have tried spray starterfluid into the throttlebody and tested the sparkplug wire with a scewdriver and my numb finger so it is getting somewhat of current and fuel thru far as i can tell. i dont know what it could be and i dont have much of any money to many parts and 100% cant afford a mechanic or tow bill. it is my only vehicle. also , oil change yesterday at walmart 5-30 full synthetic.