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Rebuilt motor problem

XploreAlaska

Well-Known Member
Joined
August 24, 2008
Messages
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City, State
Wasilla, Alaska / USMC camp pendleton, CA
Year, Model & Trim Level
1994 Limited
I got a rebuilt long block from pro-formance on friday and put it in my truck this weekend... I started it up and it runs VERY rough, surging from 800 rpm to 3500... What could be causing this? I'm going back tomorrow to work on it some more and don't know where to start other than making sure I didn't cross the plug wires. Thanks for any help!!
 






might forgot to plug something in or cross something
 






Air leak in the lower intake manifold.
 












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