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I built a 3.1 for my Trooper based on Goeffs, one tough engine, but it started loosing oil pressure after a few years, so I figure I did something wrong. But it was running great until then. I am now in the process of putting a 3.4 in my Trooper, might get it fired up today. Took it from a 95 Camero. I have had several of the 4 cylinders also but like the v6 better.
 

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You got me curious on the throttle body, I have never heard of anyone using a 5.7 throttle body, it is usually a 4.3 with 3.4 injectors. So this may be another avenue.
BTW that is an impressive list of Isuzus!
 

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Thanks Geoff, I did not know that information.
 
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