The van was cold , when checked the codes . One was a 15 and 17 , the 17 code said closed loop temp not reached or cold to long , does that mean i need to get engine up normal temp before read the codes . Because , my trouble with van if i drive at hard at high speed or for a long time it don"t want to idle and cut off , also run rough , smell some gas , i have to keep crank over and over 4 or5 times , with out giving any gas , because if i mask the gas pedal , and try crank it , i have a lot trouble getting it crank , please help thanks ricky