1998 A4, 2.8 DOHC, AHA. The other day when pulling out into traffic the engine stuttered, check engine light came on. Codes where PO302, PO304 & PO300. With the the Bentley manual checked the ohms like the book said to do. All readings a little high. 2-4 wire thru coil pack 27k, wires 6.9k and coil 15k. The plugs (NGK) looked clean. Do I need to replace all?

 

I will recommend changing the spark plugs and get some Bosch ones...I was having the same problems, but my wires were kinda messed up as well. So far no issues.

 

replace the spark plugs and also check the engine timing and get it corrected if needed. check the distributor and lubricate the cam and contacts.

 

Put new plugs in and now it purrs. Running great.