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Old 10-17-2016, 09:58 AM   #11
Bus Nut
 
Join Date: May 2014
Location: West Ohio
Posts: 406
Year: 1984
Coachwork: Bluebird
Chassis: International 1753
Engine: 6.9 International
Rated Cap: 65
Having you tried driving it with the trans in manual low? Being that it is a 12v, you don't have a computer triggering the check engine light. So odds are you have a low coolant sensor or oil psi sensor unplugged.

12v cummins isn't a heui engine. Should have either a p7100 or possibly a ve44. Both are mechanical injection.

Vacuum leak wouldn't cause power loss. If timing was off you wouldn't have power in either direction. How much of a hill are you on?

If all the engine stuff was done right, I'm leaning towards a trans or brake issue. Shift it into manual low (position labeled 1 on gear indicator) and see what you have. Also check trans fluid because that being low can keep the trans from acting right.
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