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I just got a VR4 the other day and it had 550s safc II and a 16g. I took the 550s out and put a stock injectors in the car and it ran alot better. I have an AEM wideband installed. But the problem is that when I accelerate the car kind of sputters and does not pull at about 5k. I leaned the car out a little bit and it helped a little lot and now it pulls to about 6.5k. I am running stock boost, but when i turn it up it gets really bad and it pulls hard again to about 5k and then sputters and quits pulling. when i am WOT at about 5k the A/F is 11.3 to 11.7.
 

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11.3-11.7 is good A/F under a load. Check for boost leaks and if not that Check the spark plugs for correct gap.
 
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