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Old 09-10-2012, 10:37 AM   #1
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Unhappy Rough idling issues

I have a 1995 GMC Suburban c2500 7.4L I am having a idling issues. It does start but RPM is around 600 to 800 then it stalls? I have replaced TPS sensors, MAP sensor, and the IAC valve same problem. I am questioning the EGR valve? HELP Please anyone..
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Old 09-10-2012, 11:33 AM   #2
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if you rev it, will it stay running?
another forum but its good info. did you check for vacuum leaks with some carb cleaner?

How do I test the EGR on a '94 7.5 TBI
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Old 09-10-2012, 12:05 PM   #3
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Default Rough iding issues

Stalls when I try to accelerate.
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Old 09-10-2012, 01:35 PM   #4
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you look down the tb for good conical spray from the injectors
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Old 09-10-2012, 02:20 PM   #5
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Default Rough idle

I'm looking down the throttlebody gas is flowing even
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Old 09-10-2012, 02:30 PM   #6
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Justin, could this be a bad fuel pressure regulator?
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Old 09-10-2012, 02:50 PM   #7
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To my findings little pieces of tin metal from the EGR valve upon removal , I cleaned the carbon buildup with carburetor fluid, and replaced it. I am 90% sure it could be a bad EGR valve
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Old 09-10-2012, 05:31 PM   #8
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Hope you found the problem. If not, check out the fuel pressure regulator.
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Old 09-11-2012, 07:10 AM   #9
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not real easy to check on this engine its part of the tb. you can check fuel pressure but you have to get an adapter there isnt any service port. so hopefully you found your issue
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