5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

1500rpm bucking and starting up issues

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Old 05-06-2008, 04:49 PM
  #11  
FivePointOhh
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Default RE: 1500rpm bucking and starting up issues

bump for more help. hopefully those pictures clarified things a little bit
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Old 05-06-2008, 07:26 PM
  #12  
projectresto83
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Default RE: 1500rpm bucking and starting up issues

Are you sure you don't have a leak somewhere now with maybe a cracked line? Have you tried to put in the way it was to see if it fixes the problem??
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Old 05-07-2008, 08:26 AM
  #13  
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Default RE: 1500rpm bucking and starting up issues

all the lines are new.

as far as putting it back the way it was, im going to do that but i havent had time to go out and put it back. my question was more geared towards...which one is correct?
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Old 05-07-2008, 10:50 AM
  #14  
brentloftis
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Default RE: 1500rpm bucking and starting up issues

Sorry, fell off a ladder yesterday and busted up my shoulder, if I recall from my setup the first example is the correct, the second with the PVC going back into the rear of the upper is not on mine, but again I have a stock setup.
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Old 05-07-2008, 10:59 AM
  #15  
FivePointOhh
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Default RE: 1500rpm bucking and starting up issues

sorry to hear about your accident, hopefully you're ok


well, what in the heck is that other port for on the back of the intake?
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Old 05-07-2008, 11:36 AM
  #16  
sYckmYnded
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Default RE: 1500rpm bucking and starting up issues

just throw a stall converter in it if its a automatic easy fix!

if its 5-speed you sound like u have vaccum leak.. just get a standard manuel from any parts store and route the vaccum lines the way there suposed to be, i had this same issue and it turned out to be vaccum lines in wrong places with wrong psi of vaccum

wish i coulda help you more
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Old 05-07-2008, 11:45 AM
  #17  
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Default RE: 1500rpm bucking and starting up issues

still lookin for help on the first start up issue. it happened before i ever switch the vac lines and it still does it.

will not hold its idle until about 100* temp. otherwsie i have to hold the gas down or it dies
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Old 05-09-2008, 08:53 AM
  #18  
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Default RE: 1500rpm bucking and starting up issues

bump

update.... i put the vac tubes back to the way i had them and its wayyyyyyyyyyyy better. it at least runs by itself without dying but the idle is so crazy and sometimes i have to save it.

it drops down to 300rpm and then pops back up to 1200 then 500,1000,300, 1000,500,1200....

and so on. but again when she gets warm the issues stop completely. what the heck?
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Old 05-09-2008, 10:45 AM
  #19  
nseoi
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Default RE: 1500rpm bucking and starting up issues

damn idle. i swear, i keep replacing things here and there, im only going to take it serious once i have the cash to redo my whole intake /fuel rails and injectors.
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Old 05-09-2008, 03:09 PM
  #20  
FivePointOhh
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Default RE: 1500rpm bucking and starting up issues

bump.

i just drove it to work and now just sputters when shes warm now, volts drop a bit and rpms go down to 600rpms and just jumps between 600 and 1k at stop lights.

whats going on here?
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