check firing order?, upside down, or stuck thermostat?,all wires connected?...if the engine was just replaced, i would start with all the basics of whoever installed it...you never know who does what....just my .02
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OCA Alero Chapter Member!!!!
ALERO-LESS 
1971 Olds Cutlass budget pro-touring project
2005 Nissan Altima SE-R 6spd MODDED! (wifes pocket rocket)
1998 Ford Explorer AWD 5.0...modded, and fun DD
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