well as the car drives great in the highway and on the track i have a small issue with idles. car idles just about 13.5 AFR but the car will randomly shut off. so ive tried the iacv duty cycle at 100% it seem to work but i have never had to do that. another small issue when i first start the car from being dead cold it wont hold an iddle for 5 seconds then boom snaps out of it and runs good? ive notice that when it first start afr goes to 10.2. i can email my bin to anyone that thinks they can figure it out

 

fuel pump?

check pressure at startup and when it stumbles/dies.

 

fuel set up is aeromotive 340 in tank fallowed by a bosch 044 inline we have monitorede fuel presure its fine start and when it dies

 

You need to provide the calibration along with a datalog with accurate wideband feedback for anyone to really give you any kind of clue as to what the problem could be.

 

i have no afr input into the s300 but im using a AFM1000 controller to monitor afr if i let the car sit in the sun all day the car runs great like the e85 needs to be heated for cold starts i know it sounds weird but thats what i noticed

 

how cold is it out when your having these issues? e85 is hard to burn when cold....

 

i live in southern cali not that cold maybe 58 at the coldest point