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90 300 zx auto shifts fine in the morning,crisp thru all gears. Intermintently,starts out in 2 gear and wont up shift. Recently rebuilt trans,less than 2,000. miles. Fluid good, 104,000 odm, issue started shortly after new inj and tps replced and collant bypass.No codes obd
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Without test driving, it sounds like an internal mechanical transmission problem.