Intermittent engine miss, codes P0300, P0303 and P0305?

1996 TOYOTA AVALON
172,000 MILES • 3.0L • V6 • 2WD • AUTOMATIC
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BROTHER BUZZ
  • MEMBER
  • 32 POSTS
3 weeks ago, my wife's car started missing, check engine light on with code PO300. The next day PO303 and 305. I put plugs, wires, coils, fuel pump, fuel filter, PCV valve and hose, all vacuum lines. The car ran like a new car until now, today I'm driving 35 to 45 MPH and the check engine light turned on. I put scanner on it PO305, I'm lost now.
Thinking fuel injectors but i want an expert to give me the next step, idles rough, hesitation on take offs, jerking and now this time when you turn on A/C it stalls out. Help me guys thanks, bambam
Sep 15, 2022 at 11:52 AM
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STRAILER
  • Experienced Mechanic
  • 55,267 POSTS
Chances are it is the injector, but I would remove the spark plug and check for cracks and then just replace the plug, I have seen many defective spark plugs. While the plug is out let's do a compression test which this guide can help you with:

https://www.2carpros.com/articles/how-to-test-engine-compression

If everything checks out, here is how to change out the fuel injector. Check out the images (below). Please let us know what you find. We are interested to see what it is.
Sep 16, 2022 at 4:17 AM
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