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what does it do with the maf unpluged now. if the maf is unplugged, the computer will ignor most of the other sensors and do its best to idle. so try unplugging it. and see if it starts?
what model number computeer did you install now? its not as commen on rb20 computer as it is for 25's but some of the computers are pinned differrent. s1 or s2 rb20s have different pinout's as wel/l as different sensor outputs and different intake manifolds. is your 20 a redtop or gray
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