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changed intake/runners car wont stay running HELP !!!

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Old Mar 6, 2005 | 05:37 PM
  #1  
j88l98irocz's Avatar
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From: Trumbauersville PA
Car: 88 IROC-Z twin turbo
Engine: forged 383 8-1 compression
Transmission: t56
Axle/Gears: 9in 3.50's trac loc moser axles
changed intake/runners car wont stay running HELP !!!

put on edelbrock tpi base and high flow runners ported plentium replaced upper and lower intake gaskets, set timing at 10 degrees btdc checked all vacume lines car starts up then stalls the only way it will stay running is if i hold the throttle 1/4 of the way open but as soon as i let off the car stalls any ideas guys ?
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Old Mar 6, 2005 | 05:40 PM
  #2  
RB83L69's Avatar
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From: Loveland, OH, US
Car: 4
Engine: 6
Transmission: 5
Vacuum leak

Try a propane torch, turned down REAL low, aim it all around every gasket in the whole system. Shouldn't be too hard to tell when a fgasket starts letting in propane.
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Old Mar 6, 2005 | 06:24 PM
  #3  
8Mike9's Avatar
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From: Oakdale, Ca
Car: 89 IrocZ
Engine: L98-ish
Transmission: 700R4
MAF car? Make sure the tubes under the MAF are connected, also make sure the boot didn't fold under the MAF.

Lastly, are the runner on the correct side? If not, massive vacuum leak...IIRC they will switch side to side, but leak like crazy.
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Old Mar 6, 2005 | 08:29 PM
  #4  
j88l98irocz's Avatar
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From: Trumbauersville PA
Car: 88 IROC-Z twin turbo
Engine: forged 383 8-1 compression
Transmission: t56
Axle/Gears: 9in 3.50's trac loc moser axles
Originally posted by 8Mike9
MAF car? Make sure the tubes under the MAF are connected, also make sure the boot didn't fold under the MAF.

Lastly, are the runner on the correct side? If not, massive vacuum leak...IIRC they will switch side to side, but leak like crazy.

I checked the runners they are on the correct sides the mass air is fine and the rubber boot is not folded under car is throwing no codes no vaccume leaks
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Old Mar 7, 2005 | 12:07 AM
  #5  
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From: Elgin, IL
Car: 1997 Corvette
Engine: LS1
Transmission: 4L60E
Axle/Gears: 2.73 IRS
I'm curious how you set your timing so you know it is 10* without the car actually running right. When I replaced my intake manifold gaskets, I couldn't time the car at all because it wasn't running unless I held the throttle open. Guess what it turned out to be... a vacuum leak! The brake booster vacuum line wasn't hooked up. And was causing serious issues. The RPMs were so jumpy because I had to hold the throttle open (and it still wouldn't stay at a constant RPM), that the timing was all over the place, even with the ESC wire disconnected.

Once I saw that massive leak and fixed it, the car ran rock-solid and then I was able to time it perfectly.
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Old Mar 8, 2005 | 08:10 PM
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Chris89GTA's Avatar
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From: Nashville TN
Car: 1989 Trans Am
Engine: 355 HSR
Transmission: Pro-Built 700r4 w/ 3400 converter
Axle/Gears: 10 bolt w/ 3.42 gears
Check for vacuum leaks. There is always something to forget to hook back up, or a passage that is left not snugged up...
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