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Old 03-05-2016, 11:57 PM   #1
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454 TBI running ruff

I have a Georgie Boy Pursuit on a 1995 P30 chassis 454 TBI with 72000 miles.
Took it out for a test drive before our spring trip. Drove about 50 miles, it ran fine for the first 30-40 mile, stopped and ate lunch, after that the rest of the way home it was missing out or starved for fuel the rest of the way home.
It seams to cruise ok but when you give it the gas it spudders/misses.
I had been home about have hour, started it up and it ran fine. I let it run until it started getting hot and it was still running fine.
I put a new fuel filter on in the fall. I checked all the vacuum lines.

Hope somebody can help me out. We plan on leaving in about two weeks.

Thanks,
John
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Old 03-06-2016, 08:28 AM   #2
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Have you put a code reader on it. Could be a egr valve?
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Old 03-06-2016, 08:36 AM   #3
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The fuel injector on the TBI fires every other cylinder. It fires four times as much as a normal fuel injected injector. You injectors have the same as 288,000 miles on a normal 8 cylinder injector. You might have a bad injector.
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Old 03-07-2016, 05:53 AM   #4
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Check your spark plugs, under a load you may have one or more misfiring.
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Old 03-07-2016, 10:08 AM   #5
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Are you knowledgeable about ECMs and fuel injection systems and sensors? Or want to learn? Your 1995 is OBD1 and engine codes can retrieved via the check engine light - http://www.troublecodes.net/gm/.

Besides some the mechanical that you have already checked there are many other sensors that can be reading out of range, output devices not working correctly, etc. The ECM will log some of those and set codes if it is programmed to do so.

Unfortunately OBD1 is not as advanced as OBD2 for diagnostics and troubleshooting. As well 1995 is a mixed up year as it is the last year before OBD2 was fully implemented by most manufacturers. Some 1995s had OBD2 ports with OBD1 programming. Most auto parts stores don't carry OBD1 code readers as OBD1 has too much variability.

Sorry cannot help more.
Brian
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Old 03-08-2016, 05:48 PM   #6
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I changed the fuel filter
Changed the spark plugs to autolite double platinum
I use a paper clip on the OBD nd it flashed 12
I drove it about 50 miles today and it ran good.
I think/hope I have it fixed.

Thanks for the suggestions and help,
John
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Old 03-10-2016, 06:33 AM   #7
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Glad all seems fine. Thanks for the update.
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