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1973 - 1979 F-100 & Larger F-Series Trucks Discuss the Dentsides Ford Truck

Shaking

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Old 08-16-2014, 10:58 AM
LKD LKD is offline
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Shaking

i am having trouble with getting my 78 F250 with a 400 to idol smooth. it idols rough and shakes the hole truck. it goes away at around 1100 rpm. I changed the plugs. Found a vacuum leak around the manifold. replaced valley pan with just regular intake gaskets. Couldn't find anymore leaks. Not sure were to go next. I could use some ideas and help. Thank you.
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Old 08-16-2014, 12:16 PM
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OldMetal OldMetal is offline
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What did the plugs look like when you pulled them out? That will tell you a lot.
The best thing to do is take a compression test and if thats ok do a complete tune up, wires, cap, rotor and points if it has them
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Old 08-16-2014, 02:36 PM
LKD LKD is offline
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Thank you.
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Old 08-16-2014, 02:36 PM
 
 
 
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