Rough running?

2001 CHEVROLET SILVERADO
150,000 MILES • 5.3L • V8 • 2WD • AUTOMATIC
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SHIPWRIGHT
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I recently picked up a 1954 Chrysler Windsor with a LM7 5.3 Gen 3 swap out of a 2001 Silverado, I believe. It idles fine but runs bad on acceleration. Purge valve is abandoned. No wires or vacuum lines. No charcoal canister. No vac line to fuel pressure regulator either. I installed a vacuum line to FPR from intake manifold. No change. I'm going to try the carburetor cleaner trick for vacuum leaks tomorrow. Anything else I should look at? Thanks
Sep 3, 2023 at 10:56 AM
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SHIPWRIGHT
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I checked the fuel pressure at the rail. It is around 55 PSI with no change on acceleration.
Sep 3, 2023 at 11:00 AM
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STRAILER
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Way cool! sweet car can you upload some picks? Also, I would install a new set of spark plugs and coils they go out often on these engines.

Here is a swap we did in our shop:

https://youtu.be/mN5ct7bafTI?si=qPZWm34Ia1DbFp66

This guide may help as well:

https://www.2carpros.com/articles/engine-misfires-or-runs-rough

Let us know what happens and please upload pictures or videos of the problem so we can see what's going on.
Sep 4, 2023 at 5:30 AM
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SHIPWRIGHT
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Thanks, Ken.

I just located the OBD2 port under the carpet under the seat. Going to scan it tomorrow and see what codes pop up. I’ll keep posting my progress. I have new spark plugs, coils and wires coming this week. Checking vacuum tomorrow too. Love your video and project car. Thanks for your reply.
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Sep 4, 2023 at 6:48 AM
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STRAILER
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wow, super cool ride. Thanks for the image. I think the plugs and coil will fix it, also don't forget to install new plug wires as well.
Sep 5, 2023 at 4:07 AM
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