doesnt the o2 sensor let the ecu know the car is running rich or lean and correct the pulse width.thsi is my first ford most of the cars i had used cc instead of lbs per hour. im guessing toyota and ford fuel injection are different. from what i was told with toyotas going to big just caused a rich idle cause the pulse width could only be so short and full throttle put it in to closed loop wich ran it in a preprogrammed mode as if the stock injectors were in. liek on my odl mr2 it came with 185cc injectors and i switched them to 250cc injectors from a 2.0 and the mr2 had a 1.6. the car idled and ran real good but was a little rich at wide open throttle. soem peopel had tried 290cc injectors from a 3.0 non turbo supra but had a realy rich idle and real rich at wide open throttle. usually playing with the afm spring coudl adjust teh a\f ratio a bit. loosen it for richer and tighten it for leaner.
