Hello gentlemen, allow me to start by saying im no mechanic & im not sure if this is appropriate, but maybe it might give you another idea or option ??? I have had the same problem but with my motorcycle its 2000 Suzuki TLR ( the engine only had 25 thousand k's on it ) cold start no problem once to operating temp and im off the throttle ie coming to a set of traffic lights or idle. The revs would drop and then the engine would cut out, but it then would start straight away with a single push of the start button, no error codes nothing ????? After nearly 9 months of dyno tunning & replacing various parts & tolerence checks + electrical , it turned out I had some issue with wear inside the throttle body alloy casting, once the engine is hot one of the butterflys lost its tension ( sorry as im not sure what to call it ) it would close causing the engine to shut down. When my Mechanic showed me the problem visually ( again sorry if I dont explain myself well ) he put both alloy throttle bodys ( 1 borrowed ) side by side he then asked me to, by hand rotate the Actuator ??? forward comparing the 2 throttle bodys my original started off with resistance then as I continued moving the Actuator forward it lost all tension,causing the butterfly to close continuing forward it would open again and give me tension all the way to fully open. I hope this helps in some way maybe leading to other possible sollutions, I just thought id share my experience with a similar fault ... Cheers Mike