We are having problem with P1381 already replaced spark plugs, cables, checked the alternator, replaced the distributor, cleaned all the sensors attached to the throttle body my son said he just gets the code when the car is warm and it is hot outside (Texas 100F) Does anybody have any idea about what should we check next. Car stalls when you go to accelerate after fully stopping and shoots the code but starts right up and runs fine. Got the code a while ago, swapped a lot of stuff and car worked fine for 2 weeks.