After replacing plugs, wires, distributor rotor and cap vehicle still missing and backfiring

Welcome to 2CarPros.

First, is it backfiring from the exhaust or intake? Also, are you certain you have the plug wires installed in the correct firing order? Have you pulled diagnostic trouble codes so we know which cylinder is misfiring?

Take a look through this link and see if there is anything helpful:

https://www.2carpros.com/articles/engine-backfires-while-running

A lot of times, a backfire can be caused by fuel pressure, a vacuum leak, or ignition timing. Based on the mileage, I don't suspect any internal engine problems, but anything is possible.

If you want (and I suggest it) here are a few links to help check for vacuum leaks and fuel pressure issues:

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

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I attached a pic of the firing order to help confirm the plug wires are going to the correct plugs. Sorry about the sad looking plug wires. I tried. LOL

Let me know if any of this helps or if you have other questions.

Take care,
Joe