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Discussion Starter #1
im haveing a problem with my car it hsa a 383 stroker with a 600 cfm holley. at firs it had a 750cfm vacuum holley but i changed it to 600 it keeps fauling out the spark plugs once i clean them or put new ones it runs good for a day or 2 .then it starts missing and running rough and shaking . i took the car to a performance shop to get it fine tune and adjusted and the only thing the found wrong was the power valve was bad .so the put new spark plugs and it was running fine i drove it home and next day again the same thing rough idle and shaking .jegs said over carbed so i switch to a 600 cfm and now the same thing what could it be
 

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im haveing a problem with my car it hsa a 383 stroker with a 600 cfm holley. at firs it had a 750cfm vacuum holley but i changed it to 600 it keeps fauling out the spark plugs once i clean them or put new ones it runs good for a day or 2 .then it starts missing and running rough and shaking . i took the car to a performance shop to get it fine tune and adjusted and the only thing the found wrong was the power valve was bad .so the put new spark plugs and it was running fine i drove it home and next day again the same thing rough idle and shaking .jegs said over carbed so i switch to a 600 cfm and now the same thing what could it be
Tune it yourself....first check your float levels.....then your mixture......then set your your curb idle...look here...its easy
http://www.holley.com/TechService/FAQ.asp
http://www.holley.com/TechService/FAQ.asp?category=Carburetor
http://www.holley.com/data/Products/Technical/199R10219-3.pdf
 

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Discussion Starter #3
so if the vacuum secondarys are opening to soon you think this would faul out the spark plugs. letting to much fuel in.:confused:
 

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so if the vacuum secondarys are opening to soon you think this would faul out the spark plugs. letting to much fuel in.:confused:
start with the easy stuff first...check your float levels...check your mixture with a vacuum guage...then set you idle...clean your plugs then run her..if it still fouls out start looking at the vacuum secondaries.bm
 
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