thinks the AFR ratio is leaner than it really is. The ecu does not use info from the lambdas before the engine is hot, so this condition would cause this kind of trouble. Or The chip you got does not fit YOUR engine. Honsetly i would skip chips alltogether (as they are not more that a best guess kind of thing) and go for something mappable. Like the Nistune. Or a full standalone. But avoid AEM. I would recomend a Vi-pec.