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spark problem? or fuel?

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Old Nov 14, 2011 | 05:23 PM
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Default spark problem? or fuel?

my truck starts hard. it will either stumble over itself or crank for about 5 seconds and then slowly starts. Also has a real slight miss at idle. can barely feel it in my seat. just a little vibration. I've replaced a lot of stuff to much to list. could it be bad wires?, stater solenoid? idk any help would be great 96 bronco 5.0 133k auto
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Old Nov 14, 2011 | 05:40 PM
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i would check spark plug gap as they age the gap gets bigger from the burn that is if you have not replaced them that might explain the long crank time
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Old Nov 14, 2011 | 05:49 PM
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I have already replaced, IAC,FPR TPS, MAF, ICM, EGR valve and sensor, plugs, wires,cap,rotor,coil,air filter,fuel pump relay, pump has 40psi so its good,new oem injectors, cleaned intake, alternator and battery are good, as good compression and there aren't any codes.
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Old Nov 14, 2011 | 06:27 PM
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wow it sounds like the only thing you didnt replace was o2 sensor. i had a 93 chevy suburban come in my shop had a really bad mis and would fall on its face if you gave it any gas turns out that it was the temp sensor to the ecm never set the light off relaced it and ran awsome i would check into it ecm might think its cold all the time
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Old Nov 14, 2011 | 06:49 PM
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but if the ecm thought it was cold all the time then why would it start perfectly normal after its warm and i shut it off and start it right back up?
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Old Nov 14, 2011 | 07:32 PM
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You'll have to do a more thorough fuel pressure check. Off, running, regulator vacuum disconnected, bleed down time.
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Old Nov 14, 2011 | 07:34 PM
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i did it only drops to 30 after its shut off
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