C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Engine stalling problem when at operating temperature/ I'm stumped

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Old Jun 24, 2010 | 09:34 AM
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From: Commerce Twsp Michigan
Default Engine stalling problem when at operating temperature/ I'm stumped

I have a 1991 Vert L98 with a 6spd. I have an intermittent problem and there are no service engine codes stored. When the engine is at normal operation temperature (driving around) then I stop and shut off the engine for 15-30 minutes when I attempt to restart, it will start/stall-start/stall unless I hold the gas pedal down a bit so the RPMs are up for about 10 seconds. At that point it will stay running but the idle will fluctuate for about 45 seconds. After that it runs fine.

The second problem is when I am driving along then down shift and brake to slow down for a turn or traffic light it will stall when I push in the clutch. I can restart on the roll and keep driving. As I mentioned above it doesn’t do this every time I drive it.

I am not sure if these problems are related. I installed a new IAC and the problem persists.

Where do I go from here? Please help me.
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Old Jun 24, 2010 | 09:55 AM
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IDK..kinda sounds like a fuel problem...
Fuel filter
Fuel pressure
Injectors

Let me know if you need pages from FSM if you don't have.
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Old Jun 24, 2010 | 10:24 AM
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From: Commerce Twsp Michigan
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Originally Posted by Jamesnns
IDK..kinda sounds like a fuel problem...
Fuel filter
Fuel pressure
Injectors

Let me know if you need pages from FSM if you don't have.
Fuel filter is new.
Fuel Pressure checked ok.
Injectors are not original. They are Pink Tops. Replaced a few years ago by the previous owner.

I have the FSM. Thank you for offering.
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Old Jun 24, 2010 | 10:35 AM
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I just solved my rough idle/stalling when hot problem with a new O2 sensor.
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Old Jun 24, 2010 | 11:23 AM
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0Paul Ruggeri
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From: Carmichael ca
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Do a search of base idle procedure. Make sure the throttle plates are clean. If that's all good do a scan test and see if any of the sensor readings are off. Also look for vacuum leaks.
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Old Jun 24, 2010 | 02:56 PM
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Originally Posted by BADDUCK
I just solved my rough idle/stalling when hot problem with a new O2 sensor.
Did you have a code show up?
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