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intermittent misfire while accelerating

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Old Jun 23, 2012 | 10:38 AM
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intermittent misfire while accelerating

hey guys new to this forum. I have been experiencing some issues with my truck sometimes it has power other times it chugs while accelerating till i hit bout 2000 rpms. Im at wits end i have replaced cps, ipr,icp,uvch's, hpop with 17*. No cells or codes any help greatly appreciated. this problem just comes and goes?????



the truck is a 1996 5speed with ts 6pos.
 
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Old Jun 23, 2012 | 11:33 PM
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Where did you get the cps? Parts store ones are junk, get one from Ford, that's what it sounds like to me.
 
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Old Jun 24, 2012 | 03:19 AM
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i have tried about 4 or 5 of them from ford even located an international black original same problem one minute it will run awesome the ext start missing. i also checked the cps wiring looks good
 
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Old Jun 24, 2012 | 08:05 AM
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look into the injector wiring harness. i had a 96 that acted goofy, replaced a few of the pig tail harnesses and all was good.
 
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Old Jun 24, 2012 | 08:07 AM
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Yeah, sounds like you have a UVCH problem if thats the case.
 
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Old Jun 24, 2012 | 08:48 AM
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He said he replaced the uvch's.
 
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Old Jun 24, 2012 | 08:52 AM
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Originally Posted by oldbird1965
He said he replaced the uvch's.
so many acronyms there I missed it, Thanks for catching me O Bearded One.
 
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Old Jun 24, 2012 | 10:56 AM
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yes i was thinking the same thing being it comes and goes like a had a short and the next minute not. I also forgot to mention its a got a new fuel/lift pump on it. Could an injector or idm come and go like this these seem to be the only things i didnt try. the truck runs darn good when it wants to lol
 
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Old Jun 24, 2012 | 11:24 AM
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Injectors generally get fussy on hot or cold, not usually intermittent.

However the IDM will do whatever it wants when it wants.

If you have somebody who can swap IDM's with you or let you borrow one, try that out.

Yours might even have water in it and thats causing the issue.
 
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Old Jun 24, 2012 | 12:03 PM
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yeah i have a freind who does but he has a sd and i heard they are a pita to take off. Ill have to see what i can brush up
 
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Old Jun 24, 2012 | 12:13 PM
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Yeah, SD one will work, and yeah, they are harder to take out.

You can always pull yours and check for water or to see if it rattles.
 
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Old Jun 24, 2012 | 12:27 PM
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im going to do that right now lol
 
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Old Jun 24, 2012 | 01:11 PM
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looks good in there no signs of water. any other ideas i really dont know what else to try. Some times when it misses it is worse than others and its more of a chugging under load. truck always idles smooth.
 
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Old Jun 24, 2012 | 01:32 PM
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Edit - disregard; thought this was a no-start issue....
 
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Old Jun 24, 2012 | 03:06 PM
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I called in a big gun.

He should come help. I hope.
 
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