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Yeah have a 2000 Tahoe with the 5.3 engine with a random

misfire 1-3-5-7. 7 being the...
Yeah have a 2000 Tahoe with the 5.3 engine with a random misfire 1-3-5-7. 7 being the worst and cleans up going forward. It only does it once in wile and when it gets above 1500 rpm it stops. Rough idle and black coming out of exhaust. New plugs, wires and coil packs are fine. Any help would be appreciated. Thanks
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Answered in 1 minute by:
9/19/2017
Amedee
Amedee, GMC Technician
Category: GM
Satisfied Customers: 26,920
Experience: ASE certified tech with advanced level specialist. Wisconsin certified emissions state inspector
Verified
Hello and welcome! Have you checked engine vacuum? You might just have a plugged converter.
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Customer reply replied 2 months ago
I have checked for leaks and can't find any. I put new cats on as well. Thinking it might be a intake manafold gasket?
It is very possible! Or a faulty oxygen sensor in bank 1.
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Customer reply replied 2 months ago
I replaced those as well. It's crazy that it runs good and then later that day starts to run like crap
we see intermittent all of the time at the shop. It is possible for it to run great for some time and then all of a sudden start running rough.
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Do you have any further questions, sir?

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Customer reply replied 2 months ago
Is it possible that the intake manafold is warped?

Yes, sir, that's possible... but not very likely.

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Customer reply replied 2 months ago
Thank you

Your welcome!

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Amedee
Amedee, GMC Technician
Category: GM
Satisfied Customers: 26,920
Experience: ASE certified tech with advanced level specialist. Wisconsin certified emissions state inspector
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