All cylinders misfiring

Maintenance/Repairs
43

I have. Not a problem as long as you do your research. Rock Auto carries NGK and Denso plugs.

44

Thatā€™s consistent with a small vacuum leak. The symptoms are worse when the throttle valve is nearly closed (idle), b/c a significant % of the airflow into the engine is from the leak. When you open the throttle valve by stepping on the accel pedal most of the air into the engine is now through the throttle opening, and the proportion of air entering the engine from the vacuum leak drops to a very small percentage of the total air flow.

47

UPDATE #2:
I went to fix my vacuum leak today and couldnā€™t reach it. The leak is from a gasket to the throttle body. The throttle body gasket is shared with the breather line for the PCV valve. This leak was present before but I think that this is the biggest cause to my problem. When I spray CCR Cleaner on the break it revs up and stabilizes for a few seconds. I pulled the throttle body off to check the gasket and the break in the gasket is a 1/4"x1/2" split between the PCV and Throttle Body causing them to have a mixture. I cleaned all of the surfaces and now I just have to wait on a new gasket. If there wasnā€™t a break in it I would have reused it since it is metal but I dont want to take that chance now. The gasket will take 2 weeks to get here so I will update as soon as I can. I will be putting my new spark plugs in tonight and then all that I am waiting on will be the gasket. Thanks for the help everyone!

48

Hope the new gasket fixes all the symptoms. Crossing fingers. Youā€™ve done a good diagnostic job there to find the vacuum leak. Yes, please let us know the result of the new gasket. Best of luck.

This reminds me of when I replaced the throttle body gasket on my Corolla. That gasket is pretty small, Iā€™d say it could fit in a 4 inch by 4 inch square, no problem. When it arrived in the mail from the gasket manufacturer, it came in a 24 inch by 36 inch package! Even the auto parts store guys thought this huge discrepancy in mailing package size to object being shipped was hilarious ā€¦ lol ā€¦

49

FINAL UPDATE:
Thank you to everyone that helped. My Audi is officially back up and running. Drove it around a bit just now and she runs better than ever. Idle rpms are lower due to the vacuum leak being gone. No longer have to take my wifes camry to work lol.