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I have a '95 engine set in my '91, the mods I performed are as follows:
'95 engine/tranny/exhaust (manifold and downpipe)
'91 S13 auto converted to stick
'91 distributor
'91 ECU, upper + lower auto harness
'91 ECT guage sensor (S14 reads hotter)
'91 upper intake manifold ( for the butterflies, due to the hesitation at take off w/the A/C on)
'91 vacuum tubes and sensors (for the EGR and butterfly accuator)
I had the richness problem to, but It's been awhile since I installed it, but I think it was the MAF sensor being bad/dirty.
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