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check for vacuum leaks....
air able to get to the manifold after the AFM can cause problems.... if your idle is set low and you have a manifold leak, then the afm won't actually be open when you initially start.... and when the afm closes, the fuel pump kicks off after the initial prime.
I actually just had the same problem on my wifes car.... had swapped to JDM parts (and after a lot of research had to swap back)... but when I went back to AFM it ran like poop. Was missing 1 bolt on the CSI.
Also, check your timing to make sure you're on. Ensure that there are no tears in the AFM tube as well.
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