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Old 03-21-2013, 03:58 AM
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1998 gm z-71 5.7

I just installed a new set of plug wires, Cap & Roter. Soon after that a problem started for no reason the truck started to skip a beat almost like the engine cut out for a nano second? I pulled the dist. and installed a new gear and the problem went away for a few hundred miles then started back up. Then I installed a new fuel pump & Filter of which the problem again went away for a day now while driving down the road it happens about every 30 seconds? I have owned the truck since new and have always kepted it well maintained. any ideas? I also replaced the Dist. pick up plug.

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Old 03-21-2013, 01:03 PM
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plug

I,m guessing that you may have a cracked spark plug that is causing the intermittant missfire.
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Old 03-21-2013, 01:50 PM
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1998 gm Z-71 5.7

Not the spark pluges, today it ran fine all morning then just an hour ago it started to buck again? I know what a bad plug will do.
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Old 03-21-2013, 03:33 PM
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Put the out cap back on and see if it goes away...... I had more than one bad NEW cap, seems like there is a hair line crack in them and it'll misfire when it gets hot etc..... but not all the time...... return the cap and put on a new one, problem went away
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