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Check your fuel pressure. Should be 38-40 PSI max at idle with vacuum connected. I would also check your injector o-rings. You can pull the rail off fairly easily on the S13 SR motors and turn the key in on and put some paper towel in front of the injector pintle caps and see if any of them are leaking on the lower o-ring that seats the injectors into the side-feed rail as well. Good starting points. Also MAF voltage and condition of maf could effect this as well as vacuum leaks. Good luck!
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