miss firing HELP

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goodmanjr821

Junior Member
Joined
Feb 13, 2014
Posts
2
Reaction score
0
Ram Year
1997
Engine
5.2 318
looking to see what would cause a bad miss fire? sometimes you start it, its fine, other times you start it, it wont idle very high, wont rev up without missing and back firing, sometimes it will run fine to you stand on it and get the rpms up high then it misses and what not,

jus changed the plugs, wires, dist cap and button, also changed the crank position sensor,
 
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