Medium and Heavy Trucks
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Hi my name is ***** ***** will try to help. What is the engine make and model?
If the timing is good and distributor and ignition system checks good then check for low compression or vacuum leaks. You should have 14-17 inches of vacuum at idle. Also this could be fuel/air/carburation related
I do not have the specs from the manual but you will be able to see if you have any cylinders that are way off from the others indicating low compression in any cylinders. Ill see if I can find something on the module. Try cleaning the throttle body.
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