i didn't have the car before the chipped ecu, but when i got the car no it didn't have these problems, they've all popped up recently. I've got the rpm's jumping, but not the engine reving, the car dying at stop lights on occasion and about once every week i step on the gas and the rpm's go to zero and it doesn't go anywhere but the car stays on. but the damn thing runs fine while it's in motion.