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Old 06-26-2012, 12:22 AM   #1
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Need some advice/wisdom

I bought my car in april 2011, and it had a terrible misfire. It would also start to hesitate alot when i hit around 40mph or so. Honestly, like every time. If i didn't have the gas pressed down more than usual, it would start hesitating right at 40 mph. Then came the misfiring. It would misfire at that mph range, about 40 mph-45 or 50 mph and then it would stop.

I replaced the spark plugs and wires (turns out one of the wires had shorted out) that summer after dealing with the problem for awhile and it ran perfect. Like absolute butter. But as the last year and few months has gone by it's ran a little rougher. It recently started to do the hesitation thing again right at 40 mph. It isn't as bad as it was. I've also noticed it misfire once or twice right after startup. It's happened maybe 4 times.

After the hesitation started, i bought a MSD streefire coil pack. It actually misfired the first time i started it up. But hasn't misfired from then, until tonight at the store. So my question is, what might be the problem? I really have no idea what could be causing fairly new spark plugs/wires to start doing this again. I've put less than 4,000 miles on the car since replacing them. Fuel filter was also replaced same time as the plugs, if that narrows it down. I need ideas please!
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Old 06-26-2012, 12:46 AM   #2
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Re: Need some advice/wisdom

sell it
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Old 06-26-2012, 12:56 AM   #3
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sell it
Been on my mind, but not an option at the moment.
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Old 06-26-2012, 07:37 AM   #4
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buy Ford motorcarft coil pack, ford motorcraft plugs and wires too and it will work like a charm . i had the same exact problem u do and it was really frustrating until those parts finally fixed everything. well good luck with it man.
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Old 06-26-2012, 08:38 AM   #5
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Re: Need some advice/wisdom

not in warranty anymore?
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Old 06-26-2012, 10:25 AM   #6
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I'll give that a try; it really is irritating as all hell. You guys think it might be that one of the plugs isn't burning the fuel completely? I've got no idea why it would be doing this again. When i pulled them last time there was only one plug that was really gunked up with carbon. As for the plugs and wires i just bought last year, i'm not sure if there was a warrantee on them or not; didn't pay much attention because i had hoped they would've been an insta-fix.
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Old 06-26-2012, 10:35 AM   #7
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maybe u got a bad cylinder ?
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Old 06-26-2012, 09:12 PM   #8
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Re: Need some advice/wisdom

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Originally Posted by PonyBoyV6 View Post
I'll give that a try; it really is irritating as all hell. You guys think it might be that one of the plugs isn't burning the fuel completely? I've got no idea why it would be doing this again. When i pulled them last time there was only one plug that was really gunked up with carbon. As for the plugs and wires i just bought last year, i'm not sure if there was a warrantee on them or not; didn't pay much attention because i had hoped they would've been an insta-fix.
pull that same plug (pull others too to be safe) and check for build up and/or burning

if it has build up on it again, smell it, oil? coolant? just fuel build up?
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Old 07-02-2012, 10:06 PM   #9
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Re: Need some advice/wisdom

Yeah I would pull all of the sparkplugs one at a time and see if there is anything unusual. If you have narrowed down to one cylinder than try just switching one thing at a time with a different cylinder (like a plug or a wire) and see if the problem moves.
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